Add releaser workflows

[blink1073]

No description provided.

[github-actions]

👈 Launch a Binder on branch blink1073/notebook/use-releaser-from-repo

[blink1073]

I set up the appropriate permissions and tokens for the bot.

[jtpio]

Thanks!

[jtpio]

Attempting to make a release with the new workflows and facing the following issue:

***github.com/jupyter/notebook.git
remote: error: GH006: Protected branch update failed for refs/heads/main.
remote: error: Changes must be made through a pull request. Required status check "tests_check" is expected.

I don't know if this check is new but I will disable it for now to finish the release.

[jtpio]

Strangely a release commit and a tag have been pushed to the repo:

But it does not appear on the main branch:

Which makes the Publish Release workflow fail because the tag already exists.

I'll try deleting the tag and restart the workflow.

[jtpio]

Looks like it went through after disabling the branch protection rule: https://github.com/jupyter/notebook/releases/tag/v7.0.0a11

For more information the workflow runs are available here: https://github.com/jupyter/notebook/actions/workflows/publish-release.yml

[blink1073]

I adjusted the permissions of the bot account and reinstated the branch protection rules.