fix(oauth): avoid overwriting user state when binding

oauth/github.go

@@ -176,3 +176,8 @@ func (p *GitHubProvider) SetProviderUserID(user *model.User, providerUserID stri
 func (p *GitHubProvider) GetProviderPrefix() string {
 	return "github_"
 }
+
+// ProviderUserIDColumn returns the users-table column storing this provider's user ID.
+func (p *GitHubProvider) ProviderUserIDColumn() string {
+	return "github_id"
+}