##### 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 -->


galaxy_api = GalaxyAPI(requirements_cli.api, 'server', 'https://config-server')
    requirements_cli.api_servers.append(galaxy_api)
    actual = requirements_cli._parse_requirements_file(requirements_file)
    assert actual['roles'] == []
    assert len(actual['collections']) == 3
    assert actual['collections'][0] == ('namespace.collection', '*', None)
    assert actual['collections'][1][0] == 'namespace2.collection2'
    assert actual['collections'][1][1] == '*'
    assert actual['collections'][1][2].api_server == 'https://galaxy-dev.ansible.com/'
    assert actual['collections'][1][2].name == 'explicit_requirement_namespace2.collection2'
    assert actual['collections'][1][2].token is None
    assert actual['collections'][2] == ('namespace3.collection3', '*', galaxy_api)
@pytest.mark.parametrize('requirements_file', ['''
- username.included_role
- src: https://github.com/user/repo
'''], indirect=True)
def test_parse_requirements_roles_with_include(requirements_cli, requirements_file):