Add list of runner labels to runner context

[igagis]

Describe the enhancement Add runner.labels variable to the runner context which will list all the runner labels.

Code Snippet Runner labels could be accessed from the workflow via ${{ runner.labels }}.

Additional information This might be useful to avoid some build steps on self-hosted runners with some pre-installed tools which would normally be installed as a build step on other runners.

[za8457]

https://github.com/za8457/za8457.git

[cv3d]

We also need to know the current runner ID.

[enchorb]

+1 for having a runner id variable exposed

Would be super useful for conditional flows depending on the machine ie. if: ${{ runner.id == 'self-hosted' }}

Ref: https://docs.github.com/en/actions/learn-github-actions/contexts#runner-context

[jupe]

Had to create workaround for this; https://github.com/marketplace/actions/runner-label-resolver, but realise that it's not reasonable to give org level access for access-token just to get runner labels... Hopefully we could get this right.

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