ci: Add github actions

.github/workflows/ci.yml

@@ -0,0 +1,54 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        crystal: [1.11.2, 1.12.2, 1.13.3, 1.14.0]
+    runs-on: ubuntu-latest
+
+    services:
+      kafka:
+        image: bitnami/kafka:latest
+        ports:
+          - 9092:9092
+          - 9094:9094
+        env:
+          KAFKA_CFG_NODE_ID: 0
+          KAFKA_CFG_PROCESS_ROLES: controller,broker
+          KAFKA_CFG_CONTROLLER_QUORUM_VOTERS: 0@kafka:9093
+          KAFKA_CFG_LISTENERS: PLAINTEXT://:9092,CONTROLLER://:9093,EXTERNAL://:9094
+          KAFKA_CFG_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092,EXTERNAL://localhost:9094
+          KAFKA_CFG_LISTENER_SECURITY_PROTOCOL_MAP: CONTROLLER:PLAINTEXT,EXTERNAL:PLAINTEXT,PLAINTEXT:PLAINTEXT
+          KAFKA_CFG_CONTROLLER_LISTENER_NAMES: CONTROLLER
+
+    steps:
+      - name: Install Crystal
+        uses: crystal-lang/install-crystal@v1
+        with:
+          crystal: ${{ matrix.crystal }}
+
+      - name: Install librdkafka
+        run: sudo -n apt-get install -qy librdkafka-dev
+
+      - name: Download source
+        uses: actions/checkout@v4
+
+      - name: Check formatting
+        run: crystal tool format --check
+
+      - name: Run unit tests
+        run: crystal spec -v --color spec/kafka spec/rdkafka
+
+      - name: Run integration tests
+        run: |
+          for test in spec/integration/*_spec.cr; do
+            crystal spec -v --color ${test};
+          done
+        timeout-minutes: 2