Add managed postgres and redis doc to gcp

Author: edw-defang

docs/concepts/managed-storage/managed-postgres.mdx

@@ -15,7 +15,7 @@ Postgres, or PostgreSQL, is a powerful open-source relational database system kn
 | [Playground](/docs/providers/playground#managed-services) | ❌ |
 | [AWS](/docs/providers/aws#managed-storage) | ✅ |
 | [DigitalOcean](/docs/providers/digitalocean#future-improvements) | ❌ |
-| [GCP](/docs/providers/gcp#future-improvements) | ✅ |
+| [GCP](/docs/providers/gcp#managed-storage) | ✅ |
 
 ## How to use Managed Postgres
 
@@ -82,7 +82,7 @@ When a project is deployed to a [production environment](/docs/concepts/deployme
 <project-name>-<service>-postgres-<id>-final-snapshot
 `
 
-The AWS Console can be used to restore a snapshot into a new instance of Postgres.
+The AWS Console can be used to restore a snapshot into a new instance of Postgres. This feature is not yet supported in GCP.
 
 {/* 
 ### Major Version Updating of Engine

docs/concepts/managed-storage/managed-redis.md

@@ -15,7 +15,7 @@ Redis is an in-memory data structure store widely used for caching, real-time an
 | [Playground](/docs/providers/playground#managed-services) | ❌ |
 | [AWS](/docs/providers/aws#managed-storage) | ✅ |
 | [DigitalOcean](/docs/providers/digitalocean#future-improvements) | ❌ |
-| [GCP](/docs/providers/gcp#future-improvements) | ✅ |
+| [GCP](/docs/providers/gcp#managed-services) | ✅ |
 
 ## How to use Managed Redis
 
@@ -40,4 +40,4 @@ configured to create a snapshot of the datastore before deletion. The snapshot w
 <project-name>-<service>-redis-<id>-final-snapshot
 `
 
-The AWS Console can be used to restore a snapshot into a new instance of Redis.
+The AWS Console can be used to restore a snapshot into a new instance of Redis. This feature is not yet supported on GCP.

docs/providers/gcp.md

@@ -59,6 +59,18 @@ The Provider builds and deploys your services using [Google Cloud Run](https://c
 
 The GCP provider does not currently support storing sensitive config values.
 
+## Managed Storage
+
+Defang can help you provision [managed storage](/docs/concepts/managed-storage/managed-storage.md) services. The following managed storage services are supported on GCP:
+
+### Managed Postgres
+
+When using [Managed Postgres](/docs/concepts/managed-storage/managed-postgres.mdx), the Defang CLI provisions an Cloud SQL instance in your account.
+
+### Managed Redis
+
+When using [Managed Redis](/docs/concepts/managed-storage/managed-redis.md), the Defang CLI provisions an Memorystore for Redis cluster in your account.
+
 ### Managed LLMs
 
 Defang offers integration with managed, cloud-native large language model services with the x-defang-llm service extension. Add this extension to any services which use the [Google Vertex AI SDKs](https://cloud.google.com/vertex-ai/docs/python-sdk/use-vertex-ai-sdk).