Inline helmlint in tag workflow and register Stakater Helm repo.

Reusable helmlint cannot add steps; helm repo add runs before ct lint so
@stakater dependencies resolve on a clean runner.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Martin Jackson

.github/workflows/update-helm-repo.yml

@@ -22,10 +22,42 @@ permissions:
   contents: read
 
 jobs:
+  # Inlined from validatedpatterns/helm-charts helmlint.yml so we can register
+  # the Stakater repo before ct lint (reusable workflows cannot gain extra steps).
   helmlint:
-    uses: validatedpatterns/helm-charts/.github/workflows/helmlint.yml@69fd10ef9199eecd093fca715ae9765c78750efc # October 6, 2025
+    name: Lint Charts
+    runs-on: ubuntu-latest
     permissions:
       contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4
+        with:
+          version: v3.12.2
+
+      - uses: actions/setup-python@v6
+        with:
+          python-version: "3.9"
+          check-latest: true
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.7.0
+
+      - name: Register Helm repo for Chart.yaml dependency (@stakater)
+        run: |
+          set -euo pipefail
+          helm repo add stakater https://stakater.github.io/stakater-charts --force-update
+
+      - name: Run chart-testing (lint)
+        run: ct lint --target-branch ${{ github.event.repository.default_branch }}
+
+      - name: Run helm lint
+        run: helm lint .
 
   update-helm-repo:
     needs: [helmlint]