update release workflow

.github/workflows/release.yaml

@@ -1,9 +1,13 @@
 name: Release Charts
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main
+    # Release only if the 'version' field in Chart.yaml was updated
+    paths:
+      - charts/**/Chart.yaml
 
 jobs:
   release:
@@ -16,12 +20,31 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Validate Chart.yaml Update
+        id: check_update_chart
+        run: |
+          LATEST_VERSION=$(curl -s https://api.github.com/repos/splunk/synthetics-helm-charts/releases/latest | grep tag_name | cut -d - -f 4 | cut -d \" -f 1)
+          CURRENT_VERSION=$(cat charts/splunk-synthetics-runner/Chart.yaml | grep -E "^version:" | cut -d " " -f 2)
+          if [ "$LATEST_VERSION" != "$CURRENT_VERSION" ]; then
+            echo "New release needed, creating..."
+            echo "VALID_UPDATE=1" >> $GITHUB_OUTPUT
+          else
+            echo "No new release needed"
+            echo "VALID_UPDATE=0" >> $GITHUB_OUTPUT
+          fi
+
       - name: Configure Git
         run: |
           git config user.name "$GITHUB_ACTOR"
           git config user.email "[email protected]"
+        if: ${{ steps.check_update_chart.outputs.VALID_UPDATE == 1 }}
+
+      - name: Install Helm
+        uses: azure/setup-helm@v4
+        if: ${{ steps.check_update_chart.outputs.VALID_UPDATE == 1 }}
 
       - name: Run chart-releaser
         uses: helm/[email protected]
         env:
           CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+        if: ${{ steps.check_update_chart.outputs.VALID_UPDATE == 1 }}