extra deps for chart build

.gitea/workflows/helm-build-push.yml

@@ -8,6 +8,12 @@ on:
       version:
         required: true
         type: string
+      chart_path:
+        required: true
+        type: string
+      extra_dependency_paths:
+        required: false
+        type: string
     secrets:
       GITEA_TOKEN:
         required: true
@@ -47,6 +53,13 @@ jobs:
           repository: niko/gitea-ci-library
           path: .ci
 
+      - name: Resolve extra subchart dependencies
+        if: inputs.extra_dependency_paths != ''
+        run: |
+          for path in $(echo "${{ inputs.extra_dependency_paths }}" | tr ',' '\n'); do
+            helm dependency update "${path}"
+          done
+
       - name: Package Helm chart
         run: |
           CHART_DIR=$(dirname "${CHART_FILE}")