Add pr trigger with label contstraint

.github/workflows/ci_release.yaml

@@ -1,4 +1,4 @@
-name: Continuous Integration Release
+name: CI on release
 
 on:
   release:

.github/workflows/ci_workflow_dispatch.yaml

@@ -1,14 +1,23 @@
-name: Continuous Integration Workflow Dispatch
+name: Build on PR or dispatch 
 
-on: workflow_dispatch
+on: 
+  workflow_dispatch:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+      - labeled
 
 jobs:
   fetch-tag:
+    if: ( github.event.action != 'labeled' && contains(github.event.pull_request.labels.*.name, 'build') ) || ( github.event.action == 'labeled' && github.event.label.name == 'build' )
     uses: ghga-de/helmfile-templates/.github/workflows/fetch-tag.yml@main
 
   push_to_docker_hub:
     needs: fetch-tag
     uses: ghga-de/helmfile-templates/.github/workflows/ci-reusable-workflow.yml@main
     with:
       tag: ${{ needs.fetch-tag.outputs.latest_tag }}-${{ github.sha }}
+      package_version: ${{ needs.fetch-tag.outputs.latest_tag }}
     secrets: inherit