Add: workflow to close issues on release

[nichwall]

This PR adds a workflow to automatically do the following to issues with a label of awaiting release whenever a release is published:

• Comment that it has been fixed with the current version number
• Close issue (if open)
• Remove awaiting release label

This workflow requires write permissions for issues, which is included in the workflow. The maintainer of the action I am using has not made a new release of the action since merging my PR to it, so I have just pinned the current SHA (not sure when they will get around to that).

I did not see any issues currently labeled as awaiting release that need to have the label removed before this workflow is ran. I tested this workflow in a personal repository and it worked well, but you may need to grant the workflow write permissions so it can access the write permissions on the issues (not 100% sure on the scoping there).

[advplyr]

This is great, thanks! It looks like the default workflow permissions should be good.

[nichwall]

Thanks! I'll hold off on making the same workflow for the app repository to make sure it works here (assume there will be a server release before the next app release)

[advplyr]

Yeah server release first