Publish `common-templates` library chart to GitLab charts repository
## Objective Publish the `common-templates` library chart to the GitLab charts Git repository and establish the publishing workflow. ## Context The library chart needs to be published in a location that is accessible to both the GitLab Helm chart and Runway standalone service charts. Publishing to the GitLab charts repository ensures discoverability and aligns with existing GitLab chart conventions. ## Tasks - [x] Set up CI/CD pipeline for `common-templates` repository - [x] Configure chart packaging and publishing workflow - [x] Publish initial version (v1.0.0) to GitLab charts repository - [x] Verify chart is accessible via OCI registry or Git repository - [x] Document publishing process for future updates - [x] Set up automated releases (e.g., via semantic-release or similar) - [x] The Semantic Release PrAT has push permissions on `main` ## Success Criteria - [x] `common-templates` v1.0.0 is published and accessible - [x] CI/CD pipeline successfully packages and publishes the chart - [x] Documentation exists for making future releases - [x] Chart can be referenced as a dependency by other charts ## Dependencies - Requires completion of #773 (extract templates) ## Related - Parent Epic: &34
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