✨(backend) add S3 objects

Inspired by Impress and @sampaccoud's work.

We use Indie Hoster’s Kubernetes objects in staging and production.
In the "dev" environment, we install the `bitnami/minio` chart to mimic
Indie Hoster’s MinIO setup.

To access the MinIO admin interface in dev, use port forwarding;
the interface runs on port 9001.

src/helm/env.d/dev/values.meet.yaml.gotmpl

@@ -51,6 +51,10 @@ backend:
     ALLOW_UNREGISTERED_ROOMS: False
     FRONTEND_SILENCE_LIVEKIT_DEBUG: False
     FRONTEND_SUPPORT: "{'id': '58ea6697-8eba-4492-bc59-ad6562585041'}"
+    AWS_S3_ENDPOINT_URL: http://minio.meet.svc.cluster.local:9000
+    AWS_S3_ACCESS_KEY_ID: meet
+    AWS_S3_SECRET_ACCESS_KEY: password
+    AWS_STORAGE_BUCKET_NAME: meet-media-storage
 
 
   migrate: