##### 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
b_collection_path = to_bytes(os.path.join(collection_path, namespace, collection), errors='surrogate_or_strict')
                if not os.path.exists(b_collection_path):
                    warnings.append("- unable to find {0} in collection paths".format(collection_name))
                    continue
                if not os.path.isdir(collection_path):
                    warnings.append("- the configured path {0}, exists, but it is not a directory.".format(collection_path))
                    continue
                collection_found = True
                try:
                    collection = Requirement.from_dir_path_as_unknown(
                        b_collection_path,
                        artifacts_manager,
                    )
                except ValueError as val_err:
                    six.raise_from(AnsibleError(val_err), val_err)
                if output_format in {'yaml', 'json'}:
                    collections_in_paths[collection_path] = {
                        collection.fqcn: {'version': collection.ver}
                    }
                    continue
                fqcn_width, version_width = _get_collection_widths([collection])
                _display_header(collection_path, 'Collection', 'Version', fqcn_width, version_width)
                _display_collection(collection, fqcn_width, version_width)
            else:
                
                collection_path = validate_collection_path(path)
                if os.path.isdir(collection_path):
                    display.vvv("Searching {0} for collections".format(collection_path))
                    collections = list(find_existing_collections(
                        collection_path, artifacts_manager,