ci: add basic github actions for PR and CI builds

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# For an overview of the syntax of this file, see
+# https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions
+
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, which is the CWD for
+    # the rest of the steps
+    - uses: actions/checkout@v2
+
+    # Caches and restores the bazel build directory.
+    - name: Cache bazel build results
+      uses: actions/[email protected]
+      env:
+        cache-name: bazel-cache
+      with:
+        path: ~/.cache/bazel
+        key: ${{ runner.os }}-${{ env.cache-name }}-${{ github.ref }}
+        restore-keys: |
+          ${{ runner.os }}-${{ env.cache-name }}-master
+
+    - name: Build the code
+      run: bazel build ...
+
+    - name: Test the code
+      run: bazel test --test_output=errors --test_tag_filters=-integration-test ...
+