add github actions config

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install Cap'n Proto
+        run: |
+            export DEBIAN_FRONTEND=noninteractive
+            sudo apt-get install -y capnproto libcapnp-dev
+
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+
+      - name: Build with Maven
+        run: |
+            make
+            mvn compile
+
+      - name: Run tests
+        run: mvn test