Release CI/CD component as experiment

Why are we doing this work

We have to publish the SLSA signer and verifier CI/CD component to the catalog so that they can be found, and used.

Relevant links

• https://docs.gitlab.com/ci/components/#publish-a-new-release
• CI/CD component for provenance generation with ... (#514814 - closed)
• Generate SLSA Verification Summary Attestation ... (#526195 - closed)

Non-functional requirements

• Documentation: covered by separate issue
• Feature flag: N/A
• Performance: N/A
• Testing: see verification steps

Implementation plan

• Add a create-release job to the project's .gitlab-ci.yml.
• Create a new v0.1.0 git tag for the release.
• Add (EXPERIMENTAL) to the project's description.

Verification steps

• Check component on the CI/CD catalog.
• Set up a test project that includes the CI/CD components.