My new github action follows a simple workflow: Whenever a user opens a pull request to the repository with the configured workflow, a comment is made on the PR with a greeting to the user and another comment with the statistics about the repository and PR are posted.
Used the github-scripts (https://github.com/actions/github-script) action to get the API and context to write my own script in the workflow.
It was a very fun exercise for me. Thankyou Dev Team for this cool contest!
A sample of this can be found on this repo for any PR
PS: I've started writing my own Github Action on my repository using JS, facing a few challenges and due to lack of docs, it's going slowly, but will publish it soon :)