Add a dispatchable workflow to run yarn fix

[TimDiekmann]

🌟 What is the purpose of this PR?

This adds a workflow which is dispatchable and should be able to fix any auto-fixable lints (like prettier).

🔗 Related links

• GitHub Actions documentation
• checkout action readme

🚫 Blocked by

🚀 Has this modified a publishable library?

This PR:

• modifies an npm-publishable library and I have added a changeset file(s)
• modifies a Cargo-publishable library and I have amended the version
• modifies a Cargo-publishable library, but it is not yet ready to publish
• modifies a block that will need publishing via GitHub action once merged
• does not modify any publishable blocks or libraries
• I am unsure / need advice

⚠️ Known issues

I'm currently not able to test it as

To trigger the workflow_dispatch event, your workflow must be in the default branch

🐾 Next steps

Test this workflow when this PR has been merged

[Alfred-Mountfield]

No easy way to get the Git of the user triggering the workflow?

[Alfred-Mountfield]

We can't find anything, the best guess we found is either from getting the most recent commit (might be a different person), or by just getting the name (but then the name is going to be associated with the github-actions email address which seems.. strange).

This seems fine for now

[Alfred-Mountfield]

Actually just found something else 😅

We do have access to the GITHUB_ACTOR env-var, and could recreate a no-reply email like so:

Note: If you created your account on GitHub.com after July 18, 2017, your noreply email address for GitHub is an ID number and your username in the form of ID+USERNAME@users.noreply.github.com. If you created your account on GitHub.com prior to July 18, 2017, your noreply email address from GitHub is USERNAME@users.noreply.github.com. You can get an ID-based noreply email address for GitHub by selecting (or deselecting and reselecting) Keep my email address private in your email settings.

• https://docs.github.com/en/account-and-profile/setting-up-and-managing-your-personal-account-on-github/managing-email-preferences/setting-your-commit-email-address

But I'm not sure if there's a reliable way for us to find which email to use, (i.e. the ID+USERNAME format or just the USERNAME one), and I can't find an API to get a public email from a user. While it may work by just guessing at the email, (who knows how GitHub actually associates these things to accounts) it feels like we'd be depending on internal implementation details and it's not really important to know who triggered a yarn fix action 😅

[Alfred-Mountfield]

Let's try it out