feat(docs): add custom gcs endpoint to gcs setup page

Author: Michal-Leszczynski

dist/etc/scylla-manager-agent.yaml

@@ -172,6 +172,11 @@
 # if possible, otherwise set path to credentials here.
 #  service_account_file: /etc/scylla-manager-agent/gcs-service-account.json
 #
+# Endpoint for GCS API, only relevant when using GCS compatible API.
+# Example default endpoint: https://storage.googleapis.com.
+# Example custom endpoint: http://localhost:32811.
+#  endpoint:
+#
 # The storage class to use when storing new objects in Google Cloud Storage.
 #  storage_class:
 

docs/source/backup/setup-gcs.rst

@@ -52,6 +52,13 @@ Use `this instruction <https://cloud.google.com/docs/authentication/production#m
 
       scylla-manager-agent check-location --location gcs:<your GCS bucket name>
 
+Additional features
+===================
+
+You can enable additional Google Cloud Storage features such as **storage class** or **endpoint**.
+Those need to be enabled on per Agent basis in the configuration file.
+Check out the ``gcs`` section in :doc:`ScyllaDB Manager Agent Config file <../config/scylla-manager-agent-config>`.
+
 Troubleshoot connectivity
 =========================