watch github actions and terminals can link now

The inestimable nedbat has written another nice little tool - watchgha, a command line tool to poll github actions and print out the status of the most recent run of a workflow. It also does something which I was vaguely aware of but hadn't really thought about - it includes link to the run in the terminal, which is clickable in modern terminals. Alhadis maintains a document about adoption, but it's basically "everything other than xterm and the awful MacOS default one", which is amazing.

Unsurprisingly, it is implemented via an escape sequence.

Very neat.