feat: add embedded dashboard E2E tests to Playwright CI (#39300)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/bashlib.sh

@@ -59,6 +59,15 @@ build-assets() {
   say "::endgroup::"
 }
 
+build-embedded-sdk() {
+  cd "$GITHUB_WORKSPACE/superset-embedded-sdk"
+
+  say "::group::Build embedded SDK bundle for E2E tests"
+  npm ci
+  npm run build
+  say "::endgroup::"
+}
+
 build-instrumented-assets() {
   cd "$GITHUB_WORKSPACE/superset-frontend"
 
@@ -276,7 +285,12 @@ playwright-run() {
   cd "$GITHUB_WORKSPACE"
   local serverlog="${HOME}/superset-playwright.log"
   local port=8081
-  PLAYWRIGHT_BASE_URL="http://localhost:${port}"
+  # Use 127.0.0.1 explicitly: `flask run` binds IPv4 only, and Node's DNS
+  # resolution for `localhost` can return `::1` first (IPv6), which then
+  # refuses against the IPv4 listener and surfaces as
+  # `connect ECONNREFUSED ::1:<port>` in API helpers driven from Node
+  # (e.g., the embedded test app's exposed token fetcher).
+  PLAYWRIGHT_BASE_URL="http://127.0.0.1:${port}"
   if [ -n "$APP_ROOT" ]; then
     export SUPERSET_APP_ROOT=$APP_ROOT
     PLAYWRIGHT_BASE_URL=${PLAYWRIGHT_BASE_URL}${APP_ROOT}/

.github/workflows/superset-e2e.yml

@@ -240,6 +240,11 @@ jobs:
         uses: ./.github/actions/cached-dependencies
         with:
           run: build-instrumented-assets
+      - name: Build embedded SDK
+        if: steps.check.outputs.python || steps.check.outputs.frontend
+        uses: ./.github/actions/cached-dependencies
+        with:
+          run: build-embedded-sdk
       - name: Install Playwright
         if: steps.check.outputs.python || steps.check.outputs.frontend
         uses: ./.github/actions/cached-dependencies

.github/workflows/superset-playwright.yml

@@ -113,6 +113,11 @@ jobs:
         uses: ./.github/actions/cached-dependencies
         with:
           run: build-instrumented-assets
+      - name: Build embedded SDK
+        if: steps.check.outputs.python || steps.check.outputs.frontend
+        uses: ./.github/actions/cached-dependencies
+        with:
+          run: build-embedded-sdk
       - name: Install Playwright
         if: steps.check.outputs.python || steps.check.outputs.frontend
         uses: ./.github/actions/cached-dependencies
@@ -125,6 +130,21 @@ jobs:
           NODE_OPTIONS: "--max-old-space-size=4096"
         with:
           run: playwright-run "${{ matrix.app_root }}" experimental/
+      - name: Run Playwright (Embedded Tests)
+        if: steps.check.outputs.python || steps.check.outputs.frontend
+        uses: ./.github/actions/cached-dependencies
+        env:
+          NODE_OPTIONS: "--max-old-space-size=4096"
+          # Scope embedded-only env vars to this step. Setting them at the job
+          # level enabled the EMBEDDED_SUPERSET feature flag inside Flask for
+          # the preceding "Required Tests" and "Experimental Tests" steps too,
+          # which loads extra handlers and destabilizes the werkzeug dev
+          # server under the 2-worker Playwright load. Required Tests should
+          # match master's Flask configuration.
+          SUPERSET_FEATURE_EMBEDDED_SUPERSET: "true"
+          INCLUDE_EMBEDDED: "true"
+        with:
+          run: playwright-run "${{ matrix.app_root }}" embedded
       - name: Set safe app root
         if: failure()
         id: set-safe-app-root