Add Helm smoke test workflow

- Introduce a GitHub Actions workflow for DevLake Helm chart smoke testing.
- Set up a temporary Kubernetes cluster with kind, install the Helm chart, and verify core services.
- Incorporate health checks for Grafana and connected MySQL datasource.
- Provide detailed diagnostics on failure to assist troubleshooting.

Signed-off-by: kahirokunn <okinakahiro@gmail.com>

Author: kahirokunn

.github/workflows/smoke-test.yml

@@ -0,0 +1,107 @@
+name: DevLake Helm Smoke Test
+
+on:
+  push:
+    branches: [ "**" ]
+  pull_request:
+    branches: [ "**" ]
+
+jobs:
+  smoke-test:
+    name: Smoke Test
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    env:
+      RELEASE_NAME: devlake
+      NAMESPACE: devlake
+      GRAFANA_ADMIN_PASSWORD: admin
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4
+
+      - name: Create kind cluster
+        uses: helm/kind-action@v1.12.0
+        with:
+          cluster_name: devlake-e2e
+
+      - name: Set up kubectl
+        uses: azure/setup-kubectl@v4
+
+      - name: Build chart dependencies (local)
+        run: |
+          helm dependency build charts/devlake
+
+      - name: Install DevLake chart (with Grafana)
+        run: |
+          ENCRYPTION_SECRET=$(openssl rand -base64 2000 | tr -dc 'A-Z' | fold -w 128 | head -n 1)
+          set -euo pipefail
+          helm install "$RELEASE_NAME" ./charts/devlake \
+            --namespace "$NAMESPACE" \
+            --create-namespace \
+            --wait \
+            --timeout 15m \
+            --set lake.encryptionSecret.secret="${ENCRYPTION_SECRET}" \
+            --set grafana.adminPassword="${GRAFANA_ADMIN_PASSWORD}"
+
+      - name: Wait for core workloads to be Ready
+        run: |
+          set -euo pipefail
+          # MySQL (StatefulSet) may take longest on cold start
+          kubectl rollout status statefulset/${RELEASE_NAME}-mysql -n "$NAMESPACE" --timeout=10m || true
+          kubectl rollout status deployment/${RELEASE_NAME}-lake -n "$NAMESPACE" --timeout=10m
+          kubectl rollout status deployment/${RELEASE_NAME}-ui -n "$NAMESPACE" --timeout=10m
+          kubectl rollout status deployment/${RELEASE_NAME}-grafana -n "$NAMESPACE" --timeout=10m
+          kubectl get pods -n "$NAMESPACE" -o wide
+
+      - name: Verify Grafana health and MySQL datasource connectivity
+        run: |
+          set -euo pipefail
+          # Port-forward Grafana service locally
+          kubectl port-forward -n "$NAMESPACE" svc/${RELEASE_NAME}-grafana 3000:80 >/tmp/pf.log 2>&1 &
+          # Wait for port-forward to come up
+          for i in {1..60}; do
+            if curl -sSf -o /dev/null http://127.0.0.1:3000/api/health; then
+              break
+            fi
+            sleep 2
+          done
+          # Basic health
+          curl -sSf http://127.0.0.1:3000/api/health | tee /tmp/grafana_health.json
+          # List datasources and find a MySQL datasource id
+          # Requires admin credentials set via helm values
+          DS_ID=$(curl -sSf -u admin:"${GRAFANA_ADMIN_PASSWORD}" http://127.0.0.1:3000/api/datasources \
+            | jq -r '[.[] | select(.type=="mysql")][0].id // empty')
+          if [ -z "${DS_ID}" ]; then
+            echo "ERROR: No MySQL datasource found in Grafana" >&2
+            exit 2
+          fi
+          echo "Found MySQL datasource id=${DS_ID}"
+          # Check datasource health
+          HEALTH_JSON=$(curl -sSf -u admin:"${GRAFANA_ADMIN_PASSWORD}" http://127.0.0.1:3000/api/datasources/${DS_ID}/health)
+          echo "$HEALTH_JSON" | tee /tmp/grafana_ds_health.json
+          echo "$HEALTH_JSON" | grep -q '"status":"OK"'
+
+      - name: Dump diagnostics on failure
+        if: failure()
+        run: |
+          echo "===== Helm list ====="
+          helm list -n "$NAMESPACE" || true
+          echo "===== Helm status ====="
+          helm status "$RELEASE_NAME" -n "$NAMESPACE" || true
+          echo "===== Kubernetes objects ====="
+          kubectl get all -n "$NAMESPACE" || true
+          echo "===== Describe MySQL ====="
+          kubectl describe statefulset/${RELEASE_NAME}-mysql -n "$NAMESPACE" || true
+          kubectl logs statefulset/${RELEASE_NAME}-mysql -n "$NAMESPACE" --all-containers --tail=200 || true
+          echo "===== Describe Lake ====="
+          kubectl describe deploy/${RELEASE_NAME}-lake -n "$NAMESPACE" || true
+          kubectl logs deploy/${RELEASE_NAME}-lake -n "$NAMESPACE" --all-containers --tail=200 || true
+          echo "===== Describe UI ====="
+          kubectl describe deploy/${RELEASE_NAME}-ui -n "$NAMESPACE" || true
+          kubectl logs deploy/${RELEASE_NAME}-ui -n "$NAMESPACE" --all-containers --tail=200 || true
+          echo "===== Describe Grafana ====="
+          kubectl describe deploy/${RELEASE_NAME}-grafana -n "$NAMESPACE" || true
+          kubectl logs deploy/${RELEASE_NAME}-grafana -n "$NAMESPACE" --all-containers --tail=200 || true