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To update a container image:
* [Authenticate](https://docs.gitlab.com/ee/user/packages/container_registry/#authenticate-with-the-container-registry) with the GitLab Container Registry
* Build and push an image:
```
$ image="base/ubuntu-18.04"
$ dockerfile="base/Dockerfile.ubuntu-18.04"
$ date=$(date +"%Y%m%d")
$ docker build --pull -t registry.gitlab.com/lilypond/lilypond/$image:$date -f $dockerfile .
$ docker push registry.gitlab.com/lilypond/lilypond/$image:$date
```
*Note*: If building an image based on one that you did not yet push, omit the `--pull` flag to `docker-build`.
Combinations of `$container` and `$dockerfile` are:
| `$image` | `$dockerfile` | Comment |
| --- | --- | --- |
| `base/ubuntu-18.04` | `base/Dockerfile.ubuntu-18.04` | The "base" image |
| `ci/ubuntu-18.04` | `ci/Dockerfile.ubuntu-18.04` | The image for CI testing |
| `doc/ubuntu-18.04` | `doc/Dockerfile.ubuntu-18.04` | The image for building the official documentation |
|
