## Is your feature request related to a problem?

You can currently install plugins from Github and NPM sources, but not GitLab

## Describe the solution you'd like

Copy a GitLab URL to install a plugin

## Describe alternatives you've considered

Using the plugin source editor.

## Additional context

Came from a conversation in the Users' slack

#### *Thank you* for your feature request – we love each and every one!

posthog/plugins/utils.py
import io
import json
import os
import re
import tarfile
from typing import Dict, Optional
from zipfile import BadZipFile, ZipFile
import requests
def parse_github_url(url: str, get_latest_if_none=False) -> Optional[Dict[str, str]]: