ssh debug workflow

[dwoz]

What does this PR do?

Adds the ability to create a port on your local system which will get forwarded to ssh on the given runner.

• Start rtcforward.py on you local system:

(venv310) dan@carbon:~/src/salt$ python3 .github/actions/ssh-tunnel/rtcforward.py offer --port 5222
-- offer --
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-- end offer --

• Provide the name of a runner, your ssh pubic key, and the offer text to the "SSH Debug" workflow.

• Paste the reply from the workflow output into your local rtcfoward.py. Wait for rtcforward.py to start listening on the port provided.

• ssh to the local port.

[dmurphy18]

Given the main etc, would be nice to include a '--help' since won't remember how to use it after a long vacation 🤣