Add support for running bazel build in CI

This patch adds support for running the bazel build in CI to easily
catch bazel build regressions. Running the bazel tests will be added in
a future patch.

.github/workflows/main.yaml

@@ -82,4 +82,19 @@ jobs:
         run: |
           cd /tmp/cmake-build
           ninja llvm-granite llvm-cm
-      
+  check-bazel:
+    name: Run bazel build
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Cache Bazel
+      uses: actions/cache@v3
+      with:
+        path: |
+          ~/.cache/bazel
+        key: ${{ runner.os }}-bazel-${{ hashFiles('.bazelversion', '.bazelrc', 'WORKSPACE', 'WORKSPACE.bazel', 'MODULE.bazel') }}
+        restore-keys: |
+          ${{ runner.os }}-bazel-
+    - name: Run build
+      run: bazel build ...
+