chore(ci): add Makefile, GitHub Actions workflow, and golangci-lint config

.github/workflows/ci.yml

@@ -0,0 +1,73 @@
+---
+name: CI
+on: [push, pull_request]
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.20"
+          cache: false
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v4
+        with:
+          version: v1.56
+        env:
+          VERBOSE: "true"
+
+  tidy:
+    name: Tidy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.20"
+      - name: Check if mods are tidy
+        run: make check-tidy
+
+  # cov:
+  #   name: Coverage
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #     - uses: actions/setup-go@v5
+  #       with:
+  #         go-version: "1.20"
+  #     - name: Publish coverage
+  #       uses: paambaati/codeclimate-action@v5.0.0
+  #       env:
+  #         VERBOSE: "true"
+  #         GOMAXPROCS: 4
+  #         CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
+  #       with:
+  #         coverageCommand: make cov
+  #         prefix: github.com/${{ github.repository }}
+  #         coverageLocations: |
+  #           ${{ github.workspace }}/coverage.out:gocov
+
+  test:
+    name: Test
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        go_version:
+          - "1.20"
+          - "1.21"
+          - "1.22"
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.22"
+      - name: Run tests
+        run: go test -v -count=1 -race ./...