##### 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 -->


os.makedirs(b_collection_path)
        with tarfile.open(self.b_path, mode='r') as collection_tar:
            files_member_obj = collection_tar.getmember('FILES.json')
            with _tarfile_extract(collection_tar, files_member_obj) as files_obj:
                files = json.loads(to_text(files_obj.read(), errors='surrogate_or_strict'))
            _extract_tar_file(collection_tar, 'MANIFEST.json', b_collection_path, b_temp_path)
            _extract_tar_file(collection_tar, 'FILES.json', b_collection_path, b_temp_path)
            for file_info in files['files']:
                file_name = file_info['name']
                if file_name == '.':
                    continue
                if file_info['ftype'] == 'file':
                    _extract_tar_file(collection_tar, file_name, b_collection_path, b_temp_path,
                                      expected_hash=file_info['chksum_sha256'])
                else:
                    os.makedirs(os.path.join(b_collection_path, to_bytes(file_name, errors='surrogate_or_strict')))
    def set_latest_version(self):
        self.versions = set([self.latest_version])
        self._get_metadata()
    def verify(self, remote_collection, path, b_temp_tar_path):
        if not self.skip:
            display.display("'%s' has not been installed, nothing to verify" % (to_text(self)))
            return
        collection_path = os.path.join(path, self.namespace, self.name)
        b_collection_path = to_bytes(collection_path, errors='surrogate_or_strict')
        display.vvv("Verifying '%s:%s'." % (to_text(self), self.latest_version))
        display.vvv("Installed collection found at '%s'" % collection_path)
        display.vvv("Remote collection found at '%s'" % remote_collection.metadata.download_url)
        
        if self.latest_version != remote_collection.latest_version: