fix: also match by email in Accounts.register_github_user

Author: zcesur

lib/algora/accounts/accounts.ex

@@ -254,7 +254,9 @@ defmodule Algora.Accounts do
       from(u in User,
         left_join: i in Identity,
         on: i.provider == "github" and i.provider_id == ^to_string(info["id"]),
-        where: u.provider == "github" and u.provider_id == ^to_string(info["id"]),
+        where:
+          (u.provider == "github" and u.provider_id == ^to_string(info["id"])) or
+            u.email == ^primary_email,
         select: {u, i}
       )