##### SUMMARY
If you have executable files in your source code they are not kept in the tarball.

Could be related to https://github.com/ansible/ansible/blob/99d7f150873011e7515851db9b44ff486efa9d77/lib/ansible/galaxy/collection.py#L763

This was noticed as I had some auxiliary scripts in my repo.

Need to also consider scripts in `files/` if/when Collections support roles.

This seems to fail the "principal of least suprise"

**Proposal 1: Keep on stripping executable flags**

Add some line to the output
`WARNING: tests/coverage.sh: source file has executable flag, though this will be ignored in generated tar.gz`
Update developing a collection documentation page
Update integration tests to ensure that executable mode is always stripped.
Update code to link to this issue

**Proposal 2: Allow executible flags**

Update developing a collection documentation page
Update integration tests to ensure that executable mode is preserved
Update code to link to this issue
Changelog


##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
ansible-galaxy

##### ANSIBLE VERSION
```paste below
2.10
```

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

<!--- Paste example playbooks or commands between quotes below -->
```yaml

```

<!--- HINT: You can paste gist.github.com links for larger files -->


orig = co.GlobalCLIArgs._Singleton__instance
    co.GlobalCLIArgs._Singleton__instance = None
    try:
        GalaxyCLI(args=['ansible-galaxy', 'collection'] + args).run()
    finally:
        co.GlobalCLIArgs._Singleton__instance = orig
def artifact_json(namespace, name, version, dependencies, server):
    json_str = json.dumps({
        'artifact': {
            'filename': '%s-%s-%s.tar.gz' % (namespace, name, version),
            'sha256': '2d76f3b8c4bab1072848107fb3914c345f71a12a1722f25c08f5d3f51f4ab5fd',
            'size': 1234,
        },
        'download_url': '%s/download/%s-%s-%s.tar.gz' % (server, namespace, name, version),
        'metadata': {
            'namespace': namespace,
            'name': name,
            'dependencies': dependencies,
        },
        'version': version
    })
    return to_text(json_str)
def artifact_versions_json(namespace, name, versions, galaxy_api, available_api_versions=None):