add PR validation for helm chart

.github/workflows/pull_request.yaml

@@ -47,6 +47,8 @@ jobs:
     # Setting up helm binary
     - name: Set up Helm
       uses: azure/setup-helm@v4
+      with:
+        version: v3.11.3
 
     - name: Helm chart unit tests
       uses: d3adb5/helm-unittest-action@v2
@@ -160,3 +162,72 @@ jobs:
           org.opencontainers.image.source=${{ github.event.repository.clone_url }}
           org.opencontainers.image.created=${{ steps.prep.outputs.created }}
           org.opencontainers.image.revision=${{ github.sha }}
+
+    - name: Check if Helm validation is needs to run
+      uses: dorny/paths-filter@v3
+      id: filter
+      with:
+        filters: |
+          chart:
+            - 'deployments/kubernetes/chart/reloader/**'
+
+    outputs:
+      helm_chart_changed: ${{ steps.filter.outputs.chart }}
+    
+  helm-validation:
+    permissions:
+      contents: read
+
+    runs-on: ubuntu-latest
+    name: Helm Chart Validation
+    needs:
+      - build
+
+    if: ${{ needs.build.outputs.helm_chart_changed }} == "true"  
+    steps:
+
+    - name: Check out code
+      uses: actions/checkout@v4
+      with:
+        ref: ${{github.event.pull_request.head.sha}}
+        fetch-depth: 0
+
+    # Setting up helm binary
+    - name: Set up Helm
+      uses: azure/setup-helm@v4
+      with:
+        version: v3.11.3
+
+    - name: Helm chart unit tests
+      uses: d3adb5/helm-unittest-action@v2
+      with:
+        charts: deployments/kubernetes/chart/reloader
+
+    - name: Add Stakater Helm Repo
+      run: |
+        helm repo add stakater https://stakater.github.io/stakater-charts
+
+    - name: Get version for chart from helm repo
+      id: chart_eval
+      run: |
+        current_chart_version=$(helm search repo stakater/reloader | tail -n 1 | awk '{print $2}')
+        echo "CURRENT_CHART_VERSION=$(echo ${current_chart_version})" >> $GITHUB_OUTPUT
+
+    - name: Get Updated Chart version from Chart.yaml
+      uses: mikefarah/yq@master
+      id: new_chart_version
+      with:
+        cmd: yq e '.version' deployments/kubernetes/chart/reloader/Chart.yaml
+
+    - name: Check Version
+      uses: aleoyakas/check-semver-increased-action@v1
+      id: check-version
+      with:
+        current-version: ${{ steps.new_chart_version.outputs.result }}
+        previous-version: ${{ steps.chart_eval.outputs.CURRENT_CHART_VERSION }}
+
+    - name: Fail if Helm Chart version isnt updated
+      if: steps.check-version.outputs.is-version-increased != 'true'
+      run: |
+        echo "Helm Chart Version wasnt updated"
+        exit 1