Make the Postgres and Redis connection strings customizable in the docker-compose

[eabasir]

Expected Behavior

The installation of the project through the docker-compose should be configurable to allow customized connection string for both Redis and Postgres.

Current Behavior

Currently, it's only the Redis connection string that can be customized by setting the REDIS_URL as an environment variable on the install_plugins service in the docker-compose. Additionally, the aforementioned value doesn't change the address of the actionRedis which is yet another issue.