05e490aa91
This allows us to temporarily deploy arbitrary branches to staging by pushing to
a staging/web branch. Removing that branch reverts to the existing and default
behaviour of deploying main.
Untested (need to deploy and trigger)
Refs:
- 942f6a9fe9
- https://docs.github.com/en/actions/learn-github-actions/contexts#steps-context
- https://stackoverflow.com/questions/57819539/github-actions-how-to-share-a-calculated-value-between-job-steps