ci: add swap and container memory limits to prevent OOM

- Recreate swap with 4GB to provide memory headroom
- Set GOGC=30 and GOMAXPROCS=2 to reduce Go memory pressure
- Add BAKE_CONTAINER_MEMORY env var support to limit test container
  memory (512MB each), preventing them from starving the test process

Author: mantzas

.github/workflows/ci.yml

@@ -16,12 +16,22 @@ jobs:
         run: docker buildx install
         shell: bash
 
+      - name: Create swap
+        run: |
+          sudo swapoff -a || true
+          sudo rm -f /swapfile
+          sudo fallocate -l 4G /swapfile
+          sudo chmod 600 /swapfile
+          sudo mkswap /swapfile
+          sudo swapon /swapfile
+        shell: bash
+
       - name: Build local image
         run: docker build -f Dockerfile -t ghcr.io/beatlabs/bake:latest .
         shell: bash
 
       - name: Bake CI
-        run: ./bake.sh ci
+        run: ./bake.sh --env GOGC=30 --env GOMAXPROCS=2 --env BAKE_CONTAINER_MEMORY=536870912 ci
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 

docker/simplecomponent.go

@@ -145,7 +145,14 @@ func (c *SimpleComponent) runContainer(session *Session, conf SimpleContainerCon
 	}
 
 	publishPorts, _ := strconv.ParseBool(os.Getenv("BAKE_PUBLISH_PORTS"))
-	hcOpts := func(hc *docker.HostConfig) { hc.PublishAllPorts = publishPorts }
+	hcOpts := func(hc *docker.HostConfig) {
+		hc.PublishAllPorts = publishPorts
+		if memLimit := os.Getenv("BAKE_CONTAINER_MEMORY"); memLimit != "" {
+			if v, err := strconv.ParseInt(memLimit, 10, 64); err == nil {
+				hc.Memory = v
+			}
+		}
+	}
 	resource, err := pool.RunWithOptions(runOpts, hcOpts)
 	if err != nil {
 		return fmt.Errorf("run %s: %w", fullContainerName, err)