FIX: Allow GitHub app client_id to be used for OAuth configuration

FIX: Allow GitHub app client_id to be used for OAuth configuration

diff --git a/config/site_settings.yml b/config/site_settings.yml
index 8838795..6209cc6 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -394,7 +394,7 @@ login:
     default: false
   github_client_id:
     default: ""
-    regex: "^[a-f0-9]+$"
+    regex: "^[a-zA-Z0-9\\.]+$"
   github_client_secret:
     default: ""
     regex: "^[a-f0-9]+$"

GitHub sha: bde8862f