local CodeBuild does not seem to perform caching

**Describe the bug**
I am running local CodeBuild container on my arm64 EC2 instance to validate buidspec.yml and build a simple Java application using maven, I noticed that the maven dependencies always get re-downloaded on each build instead of using my cache setting specified in buildspec.yml. I am only generating a zip file as an artefact (no container images built).

**To Reproduce**
Steps to reproduce the behavior:

1. Download official build image from AWS git repo
$ git clone https://github.com/aws/aws-codebuild-docker-images.git
$ cd aws-codebuild-docker-images
$ cd al2/aarch64/standard/3.0
$ docker build -t aws/codebuild/amzlinux2/arm64/standard/3.0 .

2 . Download ARM version of CodeBuild Agent
$ docker pull public.ecr.aws/codebuild/local-builds:aarch64

3. Download & Run Code CodeBuild agent
$ curl -O https://raw.githubusercontent.com/aws/aws-codebuild-docker-images/master/local_builds/codebuild_build.sh
$ chmod +x codebuild_build.sh
$ ./codebuild_build.sh -i aws/codebuild/amzlinux2/arm64/standard/3.0 -a /tmp/codebuild_local -l public.ecr.aws/codebuild/local-builds:aarch64

**Expected behavior**
I expected for CodeBuild to perform local host maven caching of downloaded artefacts. It re-downloads maven dependenies on each build as you can cleary see on output to console on all runs.

**Logs**
No indication of errors. Is this expected behaviour for local builds?
Here are my buildspec.yml contents (not the double star ** is not showing up in - '/root/.m2/**/*' but its there (just not shown in formated version of this file)...

version: 0.2

phases:
install:
runtime-versions:
java: corretto17
pre_build:
commands:
- echo Nothing to do in the pre_build phase...
build:
commands:
- echo Build started on `date`
- mvn install
post_build:
commands:
- echo Build completed on `date`

reports:
springboot-junit-iterations-demo-reports:
files:
- '**/*'
base-directory: 'target/surefire-reports'
discard-paths: no
file-format: JUNITXML
artifacts:
files:
- target/java-all-ways-to-iterate-0.0.1-SNAPSHOT.jar
cache:
paths:
- '/root/.m2/**/*'

**Platform (please complete the following information):**
- OS: Amazon Linux 2, arm64
- ami id: ami-0dfa677c1b43a9673
- ami name: amzn2-ami-kernel-5.10-hvm-2.0.20220316.0-arm64-gp2

**Additional context**
I tried performing a docker volume mount by modifying codebuild_build.sh to attempt to use my local directoryat $HOME/.m2 as the cache source once maven artifacts were downloaded in AWS CodeBuild container /root/.m2
I added thet volume mount line at position (line number 104 in .sh) but this had no effect.

...

if isOSWindows
then
docker_command+="-v //var/run/docker.sock:/var/run/docker.sock -e "
else
docker_command+="-v $HOME/.m2:/root/.m2 "
docker_command+="-v /var/run/docker.sock:/var/run/docker.sock -e "
fi

...

I also tried passing in "-d" option to codebuild_build.sh for privileged mode in case special persmission were needed but still nothing. Also logged into the conatiner via "docker run -it --entrypoint sh aws/codebuild/amzlinux2/arm64/standard/3.0 -c bash" command.
Noticed thet /root/.m2 was empty which surprised me. I then did a search for .jar files and found that they were mostly in
"opt/maven/lib and /root/.gradle
I ended up re-edited my buildspec.yml file and added those paths for cache as well but no changes (also for docker -v volume mounts)