stop action fails to find Github runner though the labeled runner does exist

[scottdickerson]

This results in lots of offline runners piling up in our repository. The EC2 instance is killed successfully but the runner isn't removed

Run machulav/ec2-github-runner@v2
  with:
    mode: stop
    github-token: ***
    label: shk8d
   <removed for security>
    aws-resource-tags: []
  env:

    AWS_DEFAULT_REGION: <removed>
    AWS_REGION: <removed>
    AWS_ACCESS_KEY_ID: ***
    AWS_SECRET_ACCESS_KEY: ***
AWS EC2 instance <removed-for-security> is terminated
GitHub self-hosted runner with label shk8d is not found, so the removal is skipped

[scottdickerson]

I think another possible fix for this is to just allow us to create these tagged as ephemeral runners and github will supposedly remove them automatically after 1 day (instead of 30 days)

[scottdickerson]

this turned out to be a permissions problem with my github-token. I think we would have caught this issue much sooner if this line was improved to actually show the error:

ec2-github-runner/src/gh.js

Line 16 in 4e0303d

return null;