Update github workflow

Author: wipfli

.github/workflows/monaco.yml

@@ -0,0 +1,40 @@
+# Derived from planetiler (Apache License)
+# https://github.com/onthegomap/planetiler/blob/main/.github/workflows/maven.yml
+
+name: Render Tests CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  render_tests:
+    name: Render tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK 21
+      uses: actions/setup-java@v3
+      with:
+        java-version: 21
+        distribution: 'temurin'
+        cache: 'maven'
+    - uses: actions/setup-node@v3
+      with:
+        node-version-file: 'render-tests/.nvmrc'
+    - name: Generate PMTiles
+      working-directory: render-tests
+      run: ./generate_pmtiles.sh
+    - name: Build styles
+      run: npm ci && npm run build
+      working-directory: styles
+    - name: Build render tests
+      run: npm ci && npm run build
+      working-directory: render-tests
+    - name: Run render tests
+      run: npm run test
+      working-directory: render-tests
+