test: gate DWH authentication integration

.github/workflows/deployment.yml

@@ -106,6 +106,31 @@ jobs:
       - name: Run authentication and authenticated F1 browser smoke
         run: bash scripts/authentication-smoke.sh
 
+  dwh-auth-linux:
+    name: DWH authentication Nginx gate
+    runs-on: ubuntu-24.04
+    timeout-minutes: 20
+    steps:
+      - name: Check out source
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+      - name: Set up Go
+        uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
+        with:
+          go-version: "1.26.5"
+          cache-dependency-path: tools/dwh-auth/go.mod
+      - name: Install Nginx
+        run: |
+          sudo apt-get update
+          sudo apt-get install --yes --no-install-recommends nginx-light
+      - name: Run DWH authentication gates
+        run: |
+          (cd tools/dwh-auth && go test -race ./... -count=1 && go vet ./...)
+          bash scripts/test-dwh-auth-build-contract.sh
+          bash scripts/test-dwh-auth-nginx-contract.sh
+          bash scripts/test-dwh-auth-nginx-integration.sh
+
   linux-docker:
     name: Linux Docker deployment and rollback
     runs-on: ubuntu-24.04