feat(ci): add ArtifactHub annotations (#179)

The following PR adds the volker-raschek/ah-annotations action. This action
reads the semantic commits between the old and new tags and uses them to
generate a changelog for ArtifactHub.

In addition, the action ensures that when pre-releases are created—for example,
v0.1.0-rc.1, v0.1.0-alpha-2, etc.—the “pre-release” annotation is added.

By default, Helm ignores pre-releases. If a user wants to install a pre-release,
they must explicitly specify this using an argument: `helm search repo gitea
--devel`.

Reviewed-on: https://gitea.com/gitea/helm-actions/pulls/179
Reviewed-by: DaanSelen <135789+daanselen@noreply.gitea.com>
Co-authored-by: Markus Pesch <markus.pesch@cryptic.systems>

.gitea/workflows/release-version.yml

@@ -47,6 +47,9 @@ jobs:
           username: ${{ secrets.DOCKER_CHARTS_USERNAME }}
           password: ${{ secrets.DOCKER_CHARTS_PASSWORD }}
 
+      - name: Add Artifacthub.io annotations
+        uses: volker-raschek/ah-annotations@v0.2.0
+
       # Using helm gpg plugin as 'helm package --sign' has issues with gpg2: https://github.com/helm/helm/issues/2843
       - name: package chart
         run: |