* Update chart version in pre-release bump
Keep Helm chart version and appVersion aligned with app releases.
* Publish Helm chart with releases
Package the Helm chart on tag releases, upload it to GitHub Pages, and attach it to the GitHub Release assets.
* Move Helm chart release to helm workflow
Publish Helm chart packages from the helm-release workflow on tags and keep publish.yml focused on app release assets.
* Derive nightly chart version from latest release
Use the most recent v* tag as the base for nightly Helm chart versions.
Updated the Helm release workflow to generate a nightly version and package the chart accordingly.
Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>