feat: add docker publish workflow

[jonathanmorley]

Pull Request

Proposed Changes

This adds a workflow that will publish the docker images (x86 and arm64) to ECR.

Notes:

• It assumes the existence of a ubuntu-22.04-medium-arm64 runner, which is non-standard
• It currently needs to be manually invoked

Readiness Checklist

Author/Contributor

• [ ] If documentation is needed for this change, has that been included in this pull request
• [ ] run npm run lint and fix any linting issues that have been introduced
• [ ] run npm run test and run tests
• [ ] If publishing new data to the public (scorecards, security scan results, code quality results, live dashboards, etc.), please request review from @jeffrey-luszcz

Reviewer

• [ ] Label as either bug, documentation, enhancement, infrastructure, maintenance, or breaking

[jonathanmorley]

Requesting review from @jeffrey-luszcz

[jonathanmorley]

This does support version numbered containers. See https://github.com/cvent/private-mirrors/actions/runs/11014902329 where I passed in a value of 0.20.0, and it was used as the label of the container, producing https://github.com/cvent/private-mirrors/pkgs/container/private-mirrors/278597478?tag=0.20.0

As mentioned in a comment, ideally this would be attached to the release workflow to auto-publish with the right version number

[ahpook]

Superseded by #302, thanks @jmeridth !