Add GESIS Server at Hetzner Online GmbH to continuous deployment

Related to #3264

Author: rgaiacs

.github/workflows/cd.yml

@@ -232,6 +232,11 @@ jobs:
             helm_version: ""
             experimental: false
 
+          - federation_member: hetzner-gesis
+            chartpress_args: ""
+            helm_version: ""
+            experimental: false
+
           # OVH deployment paused
           # - federation_member: ovh2
           #   helm_version: ""