It would really help my debugging flow if there was a way to close the tmate session such that GitHub would consider the action completed successfully and continue with the workflow, so that you could hook multiple inspection points into a workflow

I saw #4, but the recommendation there only covers aborting the whole workflow. I've tried sending process signals to tmate but nothing gets github to keep going

Could whatever code wraps around launching tmate be set up to receive USR1 or USR2 as a signal to complete the action and continue the workflow?