Add GitHub Actions CI: lint, vet, unit tests and golangci-lint

[GreedyKomodoDragon]

Problem

There is no repository-level CI workflow using GitHub Actions. Adding a GitHub Actions workflow ensures pull requests get automatic linting, vetting, and unit-test verification on supported Go versions.

Suggested change

Add .github/workflows/ci.yml to run the following on push and PRs:

• checkout
• setup Go (matrix: 1.23, 1.24)
• go mod download
• run golangci-lint run (if configured in repo)
• go vet ./...
• go test ./... -race -cover

Apply this file:

*** Begin Patch
*** Add File: .github/workflows/ci.yml
+name: CI
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: [1.23, 1.24]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Cache Go modules
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/.cache/golangci-lint
+            ${{ env.GOMODCACHE }}
+          key: ${{ runner.os }}-go-${{ matrix.go-version }}-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-${{ matrix.go-version }}-
+
+      - name: Install golangci-lint
+        run: |
+          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $GITHUB_WORKSPACE/bin v1.52.2
+          echo "::add-path::$GITHUB_WORKSPACE/bin"
+
+      - name: Go mod download
+        run: go mod download
+
+      - name: Run golangci-lint
+        run: |
+          if [ -f .golangci.yml ] || [ -f .golangci.yaml ]; then
+            $GITHUB_WORKSPACE/bin/golangci-lint run ./...
+          else
+            echo "golangci-lint not configured, skipping"
+          fi
+
+      - name: go vet
+        run: go vet ./...
+
+      - name: go test
+        run: go test ./... -race -cover
+
*** End Patch

Notes

• The action intentionally checks for .golangci.yml before running golangci-lint so repositories without a config won't fail.
• Extend workflow later to build container images and push to registry on release tags.