add helm-chart workflow

.gitea/helm-chart.yaml

@@ -0,0 +1,19 @@
+stages:
+  - package
+  - upload
+
+package-helm-chart:
+  stage: package
+  script:
+    - helm package helm/ -d ./packages/
+  artifacts:
+    paths:
+      - packages/*.tgz
+
+upload-helm-chart:
+  stage: upload
+  dependencies:
+    - package-helm-chart
+  script:
+    - helm registry login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - helm push ./packages/*.tgz oci://$CI_REGISTRY/helm-charts