_Eventually_, we want to be able to drive `semantic-release` from Bazel.

However, that requires hermetic resolution of `git` and `ssh` which is a
challenge that we do not have time for at this time.

`.bazelisk-script` implies everything must be a script reference.

We may want to include other references in the future.

Fragment is better nomenclature here.

BREAKING CHANGE: `.bazelisk-script` is now `.bazelisk-fragment`

Update any `!reference[.bazelisk-script, ...]` to `!reference[.bazelisk-fragment, ...]`

Builds a `bazelisk` image for multiple architectures using `rules_oci`.

Provides a `template.yml` GitLab CI component.