Reference specific Docker tags in action metadata

[namoscato]

Not a huge deal, but using a specific (older) version of this action (i.e. uses: namoscato/[email protected]) will just reference the v1 Docker tag which is continuously updated. Ideally the Docker tag in action.yml is updated and synchronized with the git tag.

This will likely require updating the release algorithm, i.e.

1. build and publish Docker image
2. bump action.yml's runs.image Docker tag
3. cut git release

Unfortunately, this might remove the ability to manually cut releases (flexibility that enables grouping PRs, etc)

[namoscato]

Another idea: Keep latest / v1 branches up-to-date, having them reference the major tags directly.