Add job_name_prefix as per full-pipeline template

See merge request components/opentofu!154

Only sign images on GitLab.com

See merge request components/opentofu!155

Changelog: fixed

Similar to !153 this adds support for job name prefixes when using these templates.

See merge request components/opentofu!153

Changelog: feature

This adds a new `job_name_prefix` input, the same as the `job-templates.yml` file so that this can be used mutiple times in the same config, for example to support multi-environment pipelines.

Support specifying image digests

See merge request components/opentofu!152

We cannot use it because of
https://gitlab.com/gitlab-org/gitlab/-/issues/477707

Refs https://gitlab.com/components/opentofu/-/issues/34

Changelog: feature

Reduce debian image size by moving to slim variant

See merge request components/opentofu!151

Refs https://gitlab.com/components/opentofu/-/issues/44

chore(deps): update alpine/crane docker tag to v0.20.2

See merge request components/opentofu!150

Document commands to verify image signatures

See merge request components/opentofu!149

Sign images using cosign

See merge request components/opentofu!148

Support GitLab dependency proxy when building gitlab-tofu images

Closes #70

See merge request components/opentofu!147

Closes https://gitlab.com/components/opentofu/-/issues/70

Changelog: feature

Check for dependencies when running gitlab-tofu

See merge request components/opentofu!146

Changelog: feature

fix: add missing idn2 package to debian image

See merge request components/opentofu!145

chore(deps): update dependency opentofu/opentofu to v1.8.4

See merge request components/opentofu!144

chore(deps): update registry.gitlab.com/gitlab-org/release-cli docker tag to v0.19.0

See merge request components/opentofu!141

chore(deps): update dependency gitlab-org/cli to v1.48.0

See merge request components/opentofu!140

Improve documentation around module release

See merge request components/opentofu!139

Changelog: changed