Added release chart action

.github/workflows/release-chart.yaml

@@ -0,0 +1,50 @@
+name: Release Charts
+
+on:
+  push:
+    tags:
+      - '*'
+    paths:
+      - 'charts/**'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      - name: Install Helm
+        uses: azure/setup-helm@v1
+        with:
+          version: v3.4.0
+
+      - name: Helm version checker
+        id: helm_version_checker
+        continue-on-error: true
+        run: |
+          helm repo add secret-duplicator https://ysoftdevs.github.io/secret-duplicator
+          helm repo update
+
+          newVersion="$(helm show chart helm/secret-duplicator | grep version: | awk '{print $2}')"
+          echo "Trying to upload version $newVersion"
+          uploadedVersions="$(helm search repo secret-duplicator/secret-duplicator -l | tail -n +2 | awk '{print $2}')"
+          echo "Found these versions in upstream: $uploadedVersions"
+          for uploadedVersion in $uploadedVersions; do
+            if [ "$newVersion" == "$uploadedVersion" ]; then
+              echo "Found a matching version in upstream, failing this task and skipping the release"
+              exit 1
+            fi
+          done
+          echo "No matching version found, running the release"
+
+      - name: Run chart-releaser
+        if: steps.helm_version_checker.outcome == 'success'
+        uses: helm/chart-releaser-action@v1.2.1
+        env:
+          CR_TOKEN: '${{ secrets.GITHUB_TOKEN }}'