Comment by figmert

Tmate is not available anymore, and will be fully decommissioned[0]. Use upterm[1] and action-upterm[2] instead.

Honestly, this should be built into GitHub Actions.

[0] https://github.com/tmate-io/tmate/issues/322

[1] https://upterm.dev/

[2] https://github.com/marketplace/actions/debug-with-ssh