Add CI config file

Author: Pavan-Rana

.github/workflows/ci.yaml

@@ -1 +1,58 @@
-// .github/workflows/ci.yaml
+---
+name: CI
+
+"on":
+  push:
+    branches: [main]
+  pull_request: true
+
+jobs:
+  test:
+    name: Lint, unit tests, integration tests
+    runs-on: ubuntu-latest
+
+    services:
+      redis:
+        image: redis:7-alpine
+        ports:
+          - 6379:6379
+        options: >-
+          --health-cmd "redis-cli ping"
+          --health-interval 5s
+          --health-timeout 3s
+          --health-retries 5
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.22'
+          cache: true
+
+      - name: Lint
+        uses: golangci/golangci-lint-action@v4
+        with:
+          version: latest
+
+      - name: Unit tests (with race detector)
+        run: go test -race ./internal/... -v
+
+      - name: Build binary
+        run: go build ./cmd/server/...
+
+      - name: Start service for integration tests
+        run: |
+          REDIS_ADDR=localhost:6379 ./server &
+          sleep 2  # wait for service to be ready
+        env:
+          HTTP_ADDR: ":8080"
+          GRPC_ADDR: ":50051"
+
+      - name: Integration tests
+        run: go test -tags=integration -v ./tests/integration/...
+        env:
+          REDIS_ADDR: localhost:6379
+          SERVICE_ADDR: http://localhost:8080