Add CI tests using Github actions

.github/workflows/test.yml

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+on: [push, pull_request]
+name: Test
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: [1.15.x, 1.16.x]
+
+    services:
+      etc:
+        image: quay.io/coreos/etcd
+        ports:
+          - 2379:2379
+        env:
+          ETCD_ADVERTISE_CLIENT_URLS: http://0.0.0.0:2379
+          ETCD_LISTEN_CLIENT_URLS: http://0.0.0.0:2379
+      consul:
+        image: consul
+        ports:
+          - 8500:8500
+      vault096:
+        image: vault:0.9.6
+        ports:
+          - 8200:8200
+        env:
+          VAULT_DEV_ROOT_TOKEN_ID: root
+          VAULT_DEV_LISTEN_ADDRESS: 0.0.0.0:8200
+      vault010:
+        image: vault:0.10.0
+        ports:
+          - 8222:8200
+        env:
+          VAULT_DEV_ROOT_TOKEN_ID: root
+          VAULT_DEV_LISTEN_ADDRESS: 0.0.0.0:8200
+
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Test
+      run: make test

Makefile

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+VAULT_ADDR ?= http://127.0.0.1:8200
+
+.PHONY: test
+
+test:
+	go build
+	VAULT_ADDR="$(VAULT_ADDR)" \
+	go test -v -race -cover -timeout=1m ./... && echo OK || (echo FAIL && exit 1)