ci: add blocking lint-test-build workflow with latest action versions

Add a GitHub Actions CI pipeline for pull requests and pushes to main.

The workflow runs:

- golangci-lint (blocking)

- go test ./...

- go build ./...

Use latest available action and tool versions:

- actions/checkout v6.0.2

- actions/setup-go v6.3.0

- golangci/golangci-lint-action v9.2.0

- golangci-lint v2.10.1

Why:

- enforce consistent quality gates in CI

- fail fast on lint errors

- keep action dependencies current

Author: combor

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  lint-test-build:
+    name: Lint, Test, Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6.0.2
+
+      - name: Set up Go
+        uses: actions/setup-go@v6.3.0
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@v9.2.0
+        with:
+          version: v2.10.1
+          args: --timeout=5m
+
+      - name: Run tests
+        run: go test ./...
+
+      - name: Build
+        run: go build ./...