workflow: build and release images

[tormath1]

Tested on my fork: https://github.com/tormath1/sysext-bakery/releases/tag/v0.0.1 (https://github.com/tormath1/sysext-bakery/actions/runs/5740907239/job/15559784511)

Tested with systemd-sysupdate:

storage:
  files:
    - path: /etc/sysupdate.kubernetes.d/kubernetes.conf
      contents:
        inline: |
          [Transfer]
          Verify=false

          [Source]
          Type=url-file
          Path=https://github.com/tormath1/sysext-bakery/releases/latest/download/
          [email protected]

          [Target]
          InstancesMax=3
          Type=regular-file
          Path=/opt/extensions/kubernetes
          CurrentSymlink=/etc/extensions/kubernetes.raw

[pothos]

Thanks! Looks good, I would like to also have a systemd-sysupdate config for each component be published as part of the release but that can be done later, too.