Ansible provisioner SSL validation error installing roles

_This issue was originally opened by @Olesp as hashicorp/packer#10838. It was migrated here as a result of the [Packer plugin split](https://github.com/hashicorp/packer/issues/8610#issuecomment-770034737). The original body of the issue is below._

---

#### Overview of the Issue

When using the Ansible provisioner. i try to download roles from ansible galaxy with a requirements.yml file.
When trying to get the roles I get an error message ``

Adding `galaxy_command="ansible-galaxy -c"` creates an error `read |0: file already closed`

#### Reproduction Steps

Runing the packer template to create an AMI create the issue.

### Packer version

1.7.0

### Simplified Packer Buildfile

Buildfile

```
source "amazon-ebs" "example"{
assume_role {
role_arn = "arn:aws:iam::xxxxx:role/xxxxxx"
}
instance_type = "t2.micro"
source_ami = "ami-01e7ca2ef94a0ae86"
region = "us-east-2"
ssh_username = "ubuntu"

}

build {
source "source.amazon-ebs.example" {
ami_name = "packer_generated_ami-{{timestamp}}"
ami_description = "This is the first AMI created by packer"
}

provisioner "ansible" {
playbook_file = "./project_1/playbooks/playbook.yml"
galaxy_file="./project_1/requirements.yml"
roles_path="./project_1/roles"
}
}
```

### Operating system and Environment details

Mac OS Big Sur 11.2.3
Python 3.9
Ansible 2.10.7

### Log Fragments and crash.log files

```
==> amazon-ebs.example: Provisioning with Ansible...
amazon-ebs.example: Setting up proxy adapter for Ansible....
amazon-ebs.example: Executing Ansible Galaxy
amazon-ebs.example: Starting galaxy role install process
amazon-ebs.example: [WARNING]: - andrewrothstein.miniconda was NOT installed successfully: Unknown
amazon-ebs.example: error when attempting to call Galaxy at 'https://galaxy.ansible.com/api/':
amazon-ebs.example:
amazon-ebs.example: ERROR! - you can use --ignore-errors to skip failed roles and finish processing the list.
==> amazon-ebs.example: Provisioning step had errors: Running the cleanup provisioner, if present...
==> amazon-ebs.example: Terminating the source AWS instance...
==> amazon-ebs.example: Cleaning up any extra volumes...
==> amazon-ebs.example: No volumes to clean up, skipping
==> amazon-ebs.example: Deleting temporary security group...
==> amazon-ebs.example: Deleting temporary keypair...
Build 'amazon-ebs.example' errored after 1 minute 19 seconds: Error executing Ansible: Error executing Ansible Galaxy: Non-zero exit status: exit status 1
```

Start by reproducing the failure with the simplified Packer Buildfile and requirements.yml shown in the issue. Inspect the Ansible provisioner's Galaxy execution and proxy/SSL handling; done means roles install successfully without the certificate verification failure or the reported closed-pipe error.

Written by the indexing model from the issue text.