This PR adds a github actions workflow for deploying new revisions of
the registry on pushes to main.
This means updating the new registry will continue to be as simple as
landing a PR in this repo, but it should only take as long as the docker
container takes to build to see the updates live :)
For now, updates go to dev for manual inspection, but once we're confident in the build process they'll go straight to main as well.
## Changes made
- Updated `check.sh` script to add support for automatic re-deploying in
the event that the the registry has a partial/full outage.
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Co-authored-by: Cian Johnston <cian@coder.com>