Mirror CI does not report an error if the dependent workflow fails

[ptheywood]

If the mirror repo (RSE-Sheffield/rse.sheffield.ac.uk) workflow triggered by publish.yml (the mirror step) fails, the failure is not reported on this repositories deployment, so it gets missed.

This will only happen if a github actions / ruby change has broken things on CI (as the source used is the same)

Need to find a way to get the success/failure of gh run watch and report that error in the CI on this repo which is more likely to be noticed.

We could also look at making the workflow step come from a single source using a reusable workflow / composite action, so we don't have to tweak ruby installation stuff in 4+ locations when things break (3 workflows here, 1 elsewhere).