add ci

.github/workflows/ci.yml

+name: CI
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.14.7
+      - name: "Build binaries"
+        run: make all
+      - name: "Run tests"
+        run: make test