build(github/actions): worflow for building and testing with bazel

.github/workflows/main.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout source
+      uses: actions/checkout@v3
+
+    - name: Setup bazelisk
+      uses: bazelbuild/setup-bazelisk@v2
+
+    - name: Mount bazel cache
+      uses: actions/cache@v3
+      with:
+        path: "~/.cache/bazel"
+        key: bazel
+
+    - name: Build
+      run: bazel build //...
+
+    - name: Test
+      run: bazel test //...