Chart releaser

[kesslerdev]

Objective

Provide a self-managed Helm repository to simplify the deployment and distribution of the project.

PR Summary

• Chart Organization: Moved the Helm chart from chart/ to charts/trek/. This reorganization is mandatory for the Helm publishing actions to correctly identify and process the charts.
• Version Automation: Updated the version bump workflow in .github/workflows/docker.yml to automatically synchronize the version and appVersion in charts/trek/Chart.yaml.
• Helm Release Pipeline: Integrated a new release-helm job using stefanprodan/helm-gh-pages to automate chart publishing to GitHub Pages.

To initialize an empty gh-pages branch for the repository (mandatory for helm-gh-page action):

$ git checkout --orphan gh-pages
# preview files to be deleted
$ git rm -rf --dry-run .
# actually delete the files
$ git rm -rf .