Add CI workflows

.github/workflows/ci.yaml

@@ -0,0 +1,61 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    strategy:
+          matrix:
+            go-version: [ 'stable', 'oldstable' ]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go ${{ matrix.go-version }}
+        uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
+        with:
+          go-version: ${{ matrix.go-version }}
+          cache: true
+
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@a4f60bb28d35aeee14e6880718e0c85ff1882e64 # v6.0.1
+        with:
+          version: latest
+
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    strategy:
+          matrix:
+            go-version: [ 'stable', 'oldstable' ]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+
+      - name: Set up Go ${{ matrix.go-version }}
+        uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
+        with:
+          go-version: ${{ matrix.go-version }}
+          cache: true
+
+      - name: Verify dependencies
+        run: go mod verify
+
+      - name: check that 'go mod tidy' is clean
+        run: |
+          go mod tidy
+          git diff --name-only --exit-code || (echo "Please run 'go mod tidy'."; exit 1)
+
+      - name: Run tests
+        run: go test -race -v ./...