ci: add test and releaser steps

.github/depandabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: gomod
+    directory: "/"
+    schedule:
+      interval: daily
+    open-pull-requests-limit: 10

.github/workflows/release.yml

@@ -0,0 +1,26 @@
+name: release
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.TOKEN }}

.github/workflows/test.yml

@@ -0,0 +1,30 @@
+name: Test
+
+on:
+  push:
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Setup Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.17
+
+      - name: Ensure gofmt
+        run: test -z "$(gofmt -s -d .)"
+
+      - name: Ensure go.mod is already tidied
+        run: go mod tidy
+
+      - name: Run unit tests
+        run: go test ./... -v -race -coverprofile=coverage.txt -covermode=atomic