add github action based CI

Only tests on Linux for the moment. Hope to expand that eventually.

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: ci
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  run-tests:
+    name: Run test cases
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        go: [^1]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: Install Consul and Vault for integration testing
+        run: |
+          curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo apt-key add -
+          sudo apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"
+          sudo apt-get update && sudo apt-get install consul vault
+
+      - name: Run tests
+        run: |
+          make test