fix: remove unused variables in ci

.github/ci.env

@@ -23,12 +23,6 @@ MYSQL_USER=std_notes_user
 MYSQL_PASSWORD=changeme123
 MYSQL_ROOT_PASSWORD=changeme123
 
-MONGO_HOST=secondary_db
-MONGO_PORT=27017
-MONGO_USERNAME=standardnotes
-MONGO_PASSWORD=standardnotes
-MONGO_DATABASE=standardnotes
-
 AUTH_JWT_SECRET=f95259c5e441f5a4646d76422cfb3df4c4488842901aa50b6c51b8be2e0040e9
 AUTH_SERVER_ENCRYPTION_SERVER_KEY=1087415dfde3093797f9a7ca93a49e7d7aa1861735eb0d32aae9c303b8c3d060
 VALET_TOKEN_SECRET=4b886819ebe1e908077c6cae96311b48a8416bd60cc91c03060e15bdf6b30d1f