##### SUMMARY

When I run `ansible-galaxy [type] init`, I would like to be able to use my own configured 'skeleton' to init that content.

For Ansible roles, when running `ansible-galaxy role init myrole`, I can configure a [`GALAXY_ROLE_SKELETON`](https://docs.ansible.com/ansible/latest/reference_appendices/config.html#galaxy-role-skeleton) in my `ansible.cfg`, and the init command will use that skeleton as the source for the new role.

For Ansible collections, currently there's a bug (https://github.com/ansible/ansible/issues/66255) that causes collections to use that skeleton if its set (which can lead to some confusion)—but once that bug's fixed, there's no way to specify a skeleton for a collection.

So this feature request is to add a new configuration option `GALAXY_COLLECTION_SKELETON` (environment variable `ANSIBLE_GALAXY_COLLECTION_SKELETON`) which allows a collection skeleton to be specified.

Note: the docs for `GALAXY_ROLE_SKELETON` currently state:

> Role or collection skeleton directory to use as a template for the `init` action in `ansible-galaxy`, same as `--role-skeleton`.

Therefore that would need adjusting too, if the previously mentioned bug doesn't fix that.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME

ansible-galaxy init

##### ADDITIONAL INFORMATION

N/A
self, requirements, path, artifacts_manager,
    ):
        force = context.CLIARGS['force']
        ignore_errors = context.CLIARGS['ignore_errors']
        no_deps = context.CLIARGS['no_deps']
        force_with_deps = context.CLIARGS['force_with_deps']
        
        allow_pre_release = context.CLIARGS.get('allow_pre_release', False)
        upgrade = context.CLIARGS.get('upgrade', False)
        collections_path = C.COLLECTIONS_PATHS
        if len([p for p in collections_path if p.startswith(path)]) == 0:
            display.warning("The specified collections path '%s' is not part of the configured Ansible "
                            "collections paths '%s'. The installed collection won't be picked up in an Ansible "
                            "run." % (to_text(path), to_text(":".join(collections_path))))
        output_path = validate_collection_path(path)
        b_output_path = to_bytes(output_path, errors='surrogate_or_strict')
        if not os.path.exists(b_output_path):
            os.makedirs(b_output_path)
        install_collections(
            requirements, output_path, self.api_servers, ignore_errors,
            no_deps, force, force_with_deps, upgrade,
            allow_pre_release=allow_pre_release,
            artifacts_manager=artifacts_manager,
        )
        return 0
    def _execute_install_role(self, requirements):