Replace Travis CI with Github Actions

.github/workflows/tests.yaml

@@ -0,0 +1,49 @@
+name: tests
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: read # for actions/checkout to fetch code
+
+jobs:
+  linux-amd64:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17.x
+      - name: Restore Go cache
+        uses: actions/cache@v1
+        with:
+          path: /home/runner/work/_temp/_github_home/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+      - name: Run tests
+        run: make test
+
+  darwin-amd64:
+    runs-on: macos-10.15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17.x
+      - name: Restore Go cache
+        uses: actions/cache@v1
+        with:
+          path: /home/runner/work/_temp/_github_home/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+      - name: Run tests
+        run: make test