AppRunner + two DB Instances (RDS)

Hello, I have some question about configuration App Runner Service. I have two DB instances (eg. Oracle and PostgreSQL) and I wonder if I can configure App Runner so that my Web API connects to the specified base by entering environment variables ([Key][Value]) during configuration? Without interfering with the code itself. I would like to apply one universal Docker image to several App Runner services. EG. App Runner (Key: Oracle, Value: Oracle ConnectionStrings) -> My universal Docker Image -> Oracle DB App Runner (Key: PostgreSQL, Value: PostgreSQL ConnectionStrings) -> My universal Docker Image -> PostgreSQL DB