Self Signed Certificate is not trusted

### Jenkins and plugins versions report

Environment

```text
Jenkins: 2.379
OS: Linux - 5.4.0-132-generic
---
Office-365-Connector:4.18.0
ace-editor:1.1
amazon-ecr:1.107.ve50d37906739
ant:481.v7b_09e538fcca
antisamy-markup-formatter:155.v795fb_8702324
apache-httpcomponents-client-4-api:4.5.13-138.v4e7d9a_7b_a_e61
authentication-tokens:1.4
aws-credentials:191.vcb_f183ce58b_9
aws-java-sdk:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-cloudformation:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-codebuild:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-ec2:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-ecr:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-ecs:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-efs:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-elasticbeanstalk:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-iam:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-logs:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-minimal:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-sns:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-sqs:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-ssm:1.12.287-357.vf82d85a_6eefd
awseb-deployment-plugin:0.3.21
blueocean-commons:1.26.0
blueocean-core-js:1.26.0
blueocean-dashboard:1.26.0
blueocean-git-pipeline:1.26.0
blueocean-i18n:1.26.0
blueocean-jira:1.26.0
blueocean-jwt:1.26.0
blueocean-personalization:1.26.0
blueocean-pipeline-api-impl:1.26.0
blueocean-pipeline-editor:1.26.0
blueocean-pipeline-scm-api:1.26.0
blueocean-rest:1.26.0
blueocean-rest-impl:1.26.0
blueocean-web:1.26.0
bootstrap4-api:4.6.0-5
bootstrap5-api:5.2.1-3
bouncycastle-api:2.26
branch-api:2.1051.v9985666b_f6cc
build-timeout:1.25
built-on-column:1.3
caffeine-api:2.9.3-65.v6a_47d0f4d1fe
checks-api:1.8.0
cloudbees-folder:6.800.v71307ca_b_986b
codedeploy:1.23
command-launcher:90.v669d7ccb_7c31
commons-httpclient3-api:3.1-3
commons-lang3-api:3.12.0-36.vd97de6465d5b_
commons-text-api:1.10.0-27.vb_fa_3896786a_7
conditional-buildstep:1.4.2
credentials:1214.v1de940103927
credentials-binding:523.vd859a_4b_122e6
data-tables-api:1.12.1-4
dependency-check-jenkins-plugin:5.2.1
display-url-api:2.3.7
docker-build-step:2.9
docker-commons:1.21
docker-compose-build-step:1.0
docker-java-api:3.2.13-37.vf3411c9828b9
docker-plugin:1.2.10
docker-workflow:563.vd5d2e5c4007f
durable-task:503.v57154d18d478
echarts-api:5.4.0-1
email-ext:2.92
envinject:2.892.v25453b_80e595
envinject-api:1.199.v3ce31253ed13
external-monitor-job:203.v683c09d993b_9
favorite:2.4.1
font-awesome-api:6.2.1-1
generic-webhook-trigger:1.86.2
git:4.14.3
git-client:3.13.1
git-server:99.va_0826a_b_cdfa_d
github:1.36.0
github-api:1.303-400.v35c2d8258028
github-branch-source:1696.v3a_7603564d04
gitlab-api:5.0.1-78.v47a_45b_9f78b_7
gitlab-branch-source:644.va_a_66886e07b_5
gitlab-plugin:1.6.0
gradle:2.1.1
groovy:453.vcdb_a_c5c99890
handlebars:3.0.8
handy-uri-templates-2-api:2.1.8-22.v77d5b_75e6953
hashicorp-vault-plugin:359.v2da_3b_45f17d5
htmlpublisher:1.31
http_request:1.16
instance-identity:142.v04572ca_5b_265
ionicons-api:31.v4757b_6987003
jackson2-api:2.14.1-313.v504cdd45c18b
jacoco:3.3.2
jakarta-activation-api:2.0.1-2
jakarta-mail-api:2.0.1-2
javadoc:226.v71211feb_e7e9
javax-activation-api:1.2.0-5
javax-mail-api:1.6.2-8
jaxb:2.3.7-1
jdk-tool:63.v62d2fd4b_4793
jenkins-design-language:1.26.0
jenkins-multijob-plugin:623.v03401733c9a_9
jersey2-api:2.37-1
jira:3.8
jjwt-api:0.11.5-77.v646c772fddb_0
jquery-detached:1.2.1
jquery3-api:3.6.1-2
jsch:0.1.55.61.va_e9ee26616e7
junit:1166.va_436e268e972
ldap:2.12
lockable-resources:1069.v726298f53f8c
mailer:438.v02c7f0a_12fa_4
matrix-auth:3.1.6
matrix-project:785.v06b_7f47b_c631
maven-plugin:3.20
mina-sshd-api-common:2.9.2-50.va_0e1f42659a_a
mina-sshd-api-core:2.9.2-50.va_0e1f42659a_a
momentjs:1.1.1
nexus-artifact-uploader:2.14
nexus-jenkins-plugin:3.16.465.ve8709b_fa_df42
octopusdeploy:3.1.9
okhttp-api:4.9.3-108.v0feda04578cf
pam-auth:1.10
parameterized-trigger:2.45
pipeline-aws:1.43
pipeline-build-step:2.18
pipeline-github-lib:38.v445716ea_edda_
pipeline-graph-analysis:195.v5812d95a_a_2f9
pipeline-groovy-lib:621.vb_44ce045b_582
pipeline-input-step:466.v6d0a_5df34f81
pipeline-milestone-step:101.vd572fef9d926
pipeline-model-api:2.2118.v31fd5b_9944b_5
pipeline-model-definition:2.2118.v31fd5b_9944b_5
pipeline-model-extensions:2.2118.v31fd5b_9944b_5
pipeline-rest-api:2.28
pipeline-stage-step:296.v5f6908f017a_5
pipeline-stage-tags-metadata:2.2118.v31fd5b_9944b_5
pipeline-stage-view:2.28
pipeline-utility-steps:2.14.0
plain-credentials:139.ved2b_9cf7587b
plugin-util-api:2.20.0
popper-api:1.16.1-3
popper2-api:2.11.6-2
pubsub-light:1.17
resource-disposer:0.20
run-condition:1.5
scm-api:621.vda_a_b_055e58f7
script-security:1228.vd93135a_2fb_25
snakeyaml-api:1.33-90.v80dcb_3814d35
sonar:2.15
ssh-credentials:305.v8f4381501156
ssh-slaves:2.854.v7fd446b_337c9
sshd:3.270.vb_a_e71e64c287
structs:324.va_f5d6774f3a_d
timestamper:1.21
token-macro:321.vd7cc1f2a_52c8
trilead-api:2.84.v72119de229b_7
uno-choice:2.6.4
variant:59.vf075fe829ccb
windows-slaves:1.8.1
workflow-aggregator:590.v6a_d052e5a_a_b_5
workflow-api:1200.v8005c684b_a_c6
workflow-basic-steps:994.vd57e3ca_46d24
workflow-cps:3565.v4b_d9b_8c29a_b_3
workflow-cps-global-lib:609.vd95673f149b_b
workflow-durable-task-step:1217.v38306d8fa_b_5c
workflow-job:1254.v3f64639b_11dd
workflow-multibranch:716.vc692a_e52371b_
workflow-scm-step:400.v6b_89a_1317c9a_
workflow-step-api:639.v6eca_cd8c04a_a_
workflow-support:839.v35e2736cfd5c
ws-cleanup:0.44
Result: [Plugin:Office-365-Connector, Plugin:ace-editor, Plugin:amazon-ecr, Plugin:ant, Plugin:antisamy-markup-formatter, Plugin:apache-httpcomponents-client-4-api, Plugin:authentication-tokens, Plugin:aws-credentials, Plugin:aws-java-sdk, Plugin:aws-java-sdk-cloudformation, Plugin:aws-java-sdk-codebuild, Plugin:aws-java-sdk-ec2, Plugin:aws-java-sdk-ecr, Plugin:aws-java-sdk-ecs, Plugin:aws-java-sdk-efs, Plugin:aws-java-sdk-elasticbeanstalk, Plugin:aws-java-sdk-iam, Plugin:aws-java-sdk-logs, Plugin:aws-java-sdk-minimal, Plugin:aws-java-sdk-sns, Plugin:aws-java-sdk-sqs, Plugin:aws-java-sdk-ssm, Plugin:awseb-deployment-plugin, Plugin:blueocean-commons, Plugin:blueocean-core-js, Plugin:blueocean-dashboard, Plugin:blueocean-git-pipeline, Plugin:blueocean-i18n, Plugin:blueocean-jira, Plugin:blueocean-jwt, Plugin:blueocean-personalization, Plugin:blueocean-pipeline-api-impl, Plugin:blueocean-pipeline-editor, Plugin:blueocean-pipeline-scm-api, Plugin:blueocean-rest, Plugin:blueocean-rest-impl, Plugin:blueocean-web, Plugin:bootstrap4-api, Plugin:bootstrap5-api, Plugin:bouncycastle-api, Plugin:branch-api, Plugin:build-timeout, Plugin:built-on-column, Plugin:caffeine-api, Plugin:checks-api, Plugin:cloudbees-folder, Plugin:codedeploy, Plugin:command-launcher, Plugin:commons-httpclient3-api, Plugin:commons-lang3-api, Plugin:commons-text-api, Plugin:conditional-buildstep, Plugin:credentials, Plugin:credentials-binding, Plugin:data-tables-api, Plugin:dependency-check-jenkins-plugin, Plugin:display-url-api, Plugin:docker-build-step, Plugin:docker-commons, Plugin:docker-compose-build-step, Plugin:docker-java-api, Plugin:docker-plugin, Plugin:docker-workflow, Plugin:durable-task, Plugin:echarts-api, Plugin:email-ext, Plugin:envinject, Plugin:envinject-api, Plugin:external-monitor-job, Plugin:favorite, Plugin:font-awesome-api, Plugin:generic-webhook-trigger, Plugin:git, Plugin:git-client, Plugin:git-server, Plugin:github, Plugin:github-api, Plugin:github-branch-source, Plugin:gitlab-api, Plugin:gitlab-branch-source, Plugin:gitlab-plugin, Plugin:gradle, Plugin:groovy, Plugin:handlebars, Plugin:handy-uri-templates-2-api, Plugin:hashicorp-vault-plugin, Plugin:htmlpublisher, Plugin:http_request, Plugin:instance-identity, Plugin:ionicons-api, Plugin:jackson2-api, Plugin:jacoco, Plugin:jakarta-activation-api, Plugin:jakarta-mail-api, Plugin:javadoc, Plugin:javax-activation-api, Plugin:javax-mail-api, Plugin:jaxb, Plugin:jdk-tool, Plugin:jenkins-design-language, Plugin:jenkins-multijob-plugin, Plugin:jersey2-api, Plugin:jira, Plugin:jjwt-api, Plugin:jquery-detached, Plugin:jquery3-api, Plugin:jsch, Plugin:junit, Plugin:ldap, Plugin:lockable-resources, Plugin:mailer, Plugin:matrix-auth, Plugin:matrix-project, Plugin:maven-plugin, Plugin:mina-sshd-api-common, Plugin:mina-sshd-api-core, Plugin:momentjs, Plugin:nexus-artifact-uploader, Plugin:nexus-jenkins-plugin, Plugin:octopusdeploy, Plugin:okhttp-api, Plugin:pam-auth, Plugin:parameterized-trigger, Plugin:pipeline-aws, Plugin:pipeline-build-step, Plugin:pipeline-github-lib, Plugin:pipeline-graph-analysis, Plugin:pipeline-groovy-lib, Plugin:pipeline-input-step, Plugin:pipeline-milestone-step, Plugin:pipeline-model-api, Plugin:pipeline-model-definition, Plugin:pipeline-model-extensions, Plugin:pipeline-rest-api, Plugin:pipeline-stage-step, Plugin:pipeline-stage-tags-metadata, Plugin:pipeline-stage-view, Plugin:pipeline-utility-steps, Plugin:plain-credentials, Plugin:plugin-util-api, Plugin:popper-api, Plugin:popper2-api, Plugin:pubsub-light, Plugin:resource-disposer, Plugin:run-condition, Plugin:scm-api, Plugin:script-security, Plugin:snakeyaml-api, Plugin:sonar, Plugin:ssh-credentials, Plugin:ssh-slaves, Plugin:sshd, Plugin:structs, Plugin:timestamper, Plugin:token-macro, Plugin:trilead-api, Plugin:uno-choice, Plugin:variant, Plugin:windows-slaves, Plugin:workflow-aggregator, Plugin:workflow-api, Plugin:workflow-basic-steps, Plugin:workflow-cps, Plugin:workflow-cps-global-lib, Plugin:workflow-durable-task-step, Plugin:workflow-job, Plugin:workflow-multibranch, Plugin:workflow-scm-step, Plugin:workflow-step-api, Plugin:workflow-support, Plugin:ws-cleanup]

```

### What Operating System are you using (both controller, and any agents involved in the problem)?

Ubuntu 20.04.5

### Reproduction steps

I don't think I can provide anything reproducible I'm afraid.

### Expected Results

After adding a Gitlab Project in a multibranch Pipeline, the Pipelines can be correctly run.

### Actual Results

Git can not clone the project in the local workspace. Unfortunately the git Command fails with the following error code.

```
Caused by: hudson.plugins.git.GitException: Command "/opt/gitlab/embedded/bin/git fetch --no-tags --force --progress -- https://s[URL]/[project].git +refs/heads/development:refs/remotes/origin/development" returned status code 128:
stderr: fatal: unable to access 'https://[URL]/[project].git/': SSL certificate problem: self signed certificate in certificate chain
```

### Anything else?

I can't quite understand on how this might happen.

In my git config, globally as well as locally under /opt/gitlab/embedded/bin/git I checked my git config and found an http.sslcai entry referencing the correct certificate. Also, https.sslverify is false. SSL Verífication should be disabled in any case.

Furthermore, I checked the JVM on which my jenkins and gitlab are running. The self signed certificate is also imported in the cacerts of that JVM.

In any case, it should either ignore ssl altogether and don't throw this error, or trust the connection, since the certificate is in the JVM truststore.

Does the plugin use a custom .gitconfig somewhere on the machine, I am not aware of?