gitea: Disable third party OIDC login

gitea/application.yaml

@@ -55,6 +55,8 @@ spec:
         - name: gitea
           image: gitea/gitea:1.20.2
           env:
+            - name: GITEA__OPENID__ENABLE_OPENID_SIGNIN
+              value: "false"
             - name: GITEA__SERVER__SSH_SERVER_HOST_KEYS
               value: ssh/gitea.rsa,ssh/gitea.ecdsa,ssh/gitea.ed25519
             - name: GITEA__SERVER__START_SSH_SERVER