chore: Improve test container dx (#16988)

packages/testing/containers/n8n-image-pull-policy.ts

@@ -0,0 +1,18 @@
+import { ImagePullPolicy, PullPolicy } from 'testcontainers';
+
+/**
+ * Custom pull policy for n8n images:
+ * - Never try to pull the local image
+ * - Otherwise, use the default pull policy (pull only if not present)
+ */
+export class N8nImagePullPolicy implements ImagePullPolicy {
+	constructor(private readonly image: string) {}
+
+	public shouldPull(): boolean {
+		if (this.image === 'n8nio/n8n:local') {
+			return false;
+		}
+
+		return PullPolicy.defaultPolicy().shouldPull();
+	}
+}