##### 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 -->


if not self._metadata:
            if len(self.versions) > 1:
                return {}
            self._get_metadata()
        dependencies = self._metadata.dependencies
        if dependencies is None:
            return {}
        return dependencies
    def add_requirement(self, parent, requirement):
        self.required_by.append((parent, requirement))
        new_versions = set(v for v in self.versions if self._meets_requirements(v, requirement, parent))
        if len(new_versions) == 0:
            if self.skip:
                force_flag = '--force-with-deps' if parent else '--force'
                version = self.latest_version if self.latest_version != '*' else 'unknown'
                msg = "Cannot meet requirement %s:%s as it is already installed at version '%s'. Use %s to overwrite" \
                      % (to_text(self), requirement, version, force_flag)
                raise AnsibleError(msg)
            elif parent is None:
                msg = "Cannot meet requirement %s for dependency %s" % (requirement, to_text(self))
            else:
                msg = "Cannot meet dependency requirement '%s:%s' for collection %s" \
                      % (to_text(self), requirement, parent)
            collection_source = to_text(self.b_path, nonstring='passthru') or self.api.api_server
            req_by = "\n".join(
                "\t%s - '%s:%s'" % (to_text(p) if p else 'base', to_text(self), r)
                for p, r in self.required_by
            )