ci(tag docker): tag build created by release and prerelease

- use new standard jobs `.docker:image:tag`

- sync the tag `rules` with the `build-docker` job

- tag on `dev` branch after the `merge-to-dev` job (i.e. accept
  `semantic-release` commits for `dev` only)

- remove the useless `RELEASE_PREFIX` since `/templates/Rules.yaml`
  define the `RELEASE_TAG_PREFIX`.