add ci

.github/workflows/ci.yml

@@ -0,0 +1,16 @@
+name: ci
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: bazelbuild/setup-bazelisk@v2
+      - run: bazel build //...
+      - run: bazel test //solution:solution --test_env guess=basil