add merge step

.gitea/workflows/lint-test-helm.yaml

@@ -24,13 +24,25 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Check Branch Exists
+        id: check-branch-exists
+        uses: GuillaumeFalourd/branch-exists@v1.1
+        with:
+          branch: "origin/${{ github.base_ref }}"
+
+      - name: Branch Does Not Exist
+        if: steps.check-branch-exists.outputs.exists == 'false'
+        run: echo "Branch origin/${{ github.base_ref }} was not found, likely already merged"
+
       - name: Set up Helm
+        if: steps.check-branch-exists.outputs.exists == 'true'
         uses: azure/setup-helm@v4
         with:
           token: ${{ secrets.GITEA_TOKEN }}
           version: latest
 
       - name: Lint Helm Chart
+        if: steps.check-branch-exists.outputs.exists == 'true'
         run: |
           set -e  # Exit immediately if a command exits with a non-zero status.