docs: add docs for Ceph Rados Gateway S3 (#4190)

core/src/services/s3/compatible_services.md

@@ -117,4 +117,10 @@ To connect to r2, we need to set:
 [Google Cloud Storage XML API](https://cloud.google.com/storage/docs/xml-api/overview) provides s3 compatible API.
 - `endpoint`: The endpoint of Google Cloud Storage XML API, for example: `https://storage.googleapis.com`
 - `bucket`: The bucket name.
-- To access GCS via S3 API, please enable `features = ["native-tls"]` in your `Cargo.toml` to avoid connection being reset when using `rustls`. Tracking in https://github.com/seanmonstar/reqwest/issues/1809
+- To access GCS via S3 API, please enable `features = ["native-tls"]` in your `Cargo.toml` to avoid connection being reset when using `rustls`. Tracking in https://github.com/seanmonstar/reqwest/issues/1809
+
+### Ceph Rados Gateway
+Ceph supports a RESTful API that is compatible with the basic data access model of the Amazon S3 API.
+
+For more information, refer: https://docs.ceph.com/en/latest/radosgw/s3/
+