Add CI checks

.github/workflows/ci.yml

@@ -0,0 +1,41 @@
+name: Test examples
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    - cron: '0 0 * * *'
+
+  workflow_dispatch:
+
+jobs:
+
+  test_externally:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        bazel: [7.x, last_green]
+        os: [ubuntu-latest, macos-13, macos-latest]
+    env:
+      BAZELISK_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Test examples
+        env:
+          USE_BAZEL_VERSION: ${{ matrix.bazel }}
+        working-directory: ./examples
+        run: bazelisk test //...
+
+      - name: Upload test logs
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: testlogs-${{ matrix.bazel}}-${{ matrix.os }}
+          # https://github.com/actions/upload-artifact/issues/92#issuecomment-711107236
+          path: |
+            ${{ github.workspace }}/examples/bazel-testlogs*/**/test.log