Use GH actions instead of buildkite

.github/actions/setup/action.yml

@@ -0,0 +1,12 @@
+---
+name: setup
+
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/setup-go@v6
+      with:
+        go-version-file: .go-version
+
+    - run: go install github.com/magefile/mage@v1.15.0
+      shell: bash

.github/dependabot.yml‎

@@ -0,0 +1,15 @@
+---
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directories:
+      - "/"
+      - "/.github/actions/*"
+    schedule:
+      interval: "weekly"
+      day: "sunday"
+      time: "22:00"
+    groups:
+      github-actions:
+        patterns:
+          - "*"

.github/workflows/ci.yml

@@ -0,0 +1,46 @@
+---
+name: ci
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  merge_group:
+
+# limit the access of the generated GITHUB_TOKEN
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/setup
+      - run: mage notice
+      - run: mage check
+
+  test:
+    needs: lint
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ['ubuntu-22.04', 'windows-2022']
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/setup
+      - run: go test -v -race ./...
+
+  test-preview:
+    needs: lint
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ['macos-15', 'ubuntu-24.04-arm', 'windows-11-arm']
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/setup
+      - run: go test -v ./...

NOTICE.txt

@@ -1,5 +1,5 @@
 Lunes
-Copyright 2022-2025 Elasticsearch BV
+Copyright 2022-2026 Elasticsearch BV
 
 This product includes software developed by The Apache Software
 Foundation (http://www.apache.org/).