Add CI workflow to test building with prod fixtures

.github/workflows/build.yml

@@ -0,0 +1,38 @@
+name: Build
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x,21.x]
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Python
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.11'
+
+    - name: Install Python dependencies
+      run: pip install -r requirements.txt
+
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ matrix.node-version }}
+
+    - name: Build with prod fixtures
+      env:
+        FETCH_FIXTURES_FROM: http://cloud.watonomous.ca/fixtures
+      run: |
+        npm ci
+        npm run build