Release Process

[garethjevans]

We want to support semantically versioned releases, ideally via the github release page. The issue is that if we tag & push the docker image on release, we then need to update the action.yml to point to the generated image.

Some ways of doing this could be as follows:

• user triggers a release by entering information into the release page, presses submit
• on release, build the docker image, push to ghcr.io
• update the action.yml with the new image
• commit
• untag, retag based on the new commit
• patch the release to point to the new commit

An example of this can be seen at https://github.com/jenkins-infra/jenkins-version/blob/main/.github/workflows/release.yaml