chore(release): 4.0.0 [skip ci]

# [4.0.0](https://gitlab.com/to-be-continuous/docker/compare/3.5.3...4.0.0) (2023-04-05)

### Features

* **publish:** redesign publish on prod strategy ([524ccc10](https://gitlab.com/to-be-continuous/docker/commit/524ccc10686991d63aa6f23b40a9b77f68da4cb9))

### BREAKING CHANGES

* **publish:** $PUBLISH_ON_PROD no longer supported (replaced by $DOCKER_PROD_PUBLISH_STRATEGY - see doc)