##### 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 -->


co.GlobalCLIArgs._Singleton__instance = None
    yield
    co.GlobalCLIArgs._Singleton__instance = None
@pytest.fixture()
def collection_artifact(request, tmp_path_factory):
    test_dir = to_text(tmp_path_factory.mktemp('test-ÅÑŚÌβŁÈ Collections Input'))
    namespace = 'ansible_namespace'
    collection = 'collection'
    skeleton_path = os.path.join(os.path.dirname(os.path.split(__file__)[0]), 'cli', 'test_data', 'collection_skeleton')
    collection_path = os.path.join(test_dir, namespace, collection)
    call_galaxy_cli(['init', '%s.%s' % (namespace, collection), '-c', '--init-path', test_dir,
                     '--collection-skeleton', skeleton_path])
    dependencies = getattr(request, 'param', None)
    if dependencies:
        galaxy_yml = os.path.join(collection_path, 'galaxy.yml')
        with open(galaxy_yml, 'rb+') as galaxy_obj:
            existing_yaml = yaml.safe_load(galaxy_obj)
            existing_yaml['dependencies'] = dependencies
            galaxy_obj.seek(0)
            galaxy_obj.write(to_bytes(yaml.safe_dump(existing_yaml)))
            galaxy_obj.truncate()
    call_galaxy_cli(['build', collection_path, '--output-path', test_dir])
    collection_tar = os.path.join(test_dir, '%s-%s-0.1.0.tar.gz' % (namespace, collection))
    return to_bytes(collection_path), to_bytes(collection_tar)
@pytest.fixture()
def galaxy_server():