Remove unnecessary PG_DATA environement variable from docker-compose.yml (#3394)

* Remove unnecessary PG_DATA environement variable from docker-compose.yml

There is no need to set the PostgreSQL data directory to the default location, it just adds an additional unnecessary line to the docker-compose file.

In addition, the PG_DATA isn't even the correct environment variable name (it should be PGDATA, see: https://hub.docker.com/_/postgres/), so this environment variable was never doing anything to begin with.

* Update docker-compose.dev.yml

* Update docker-compose.prod.yml

* Update docker-compose.test.yml

docker/docker-compose.dev.yml

@@ -115,7 +115,6 @@ services:
       POSTGRES_PASSWORD: ${DB_PASSWORD}
       POSTGRES_USER: ${DB_USERNAME}
       POSTGRES_DB: ${DB_DATABASE_NAME}
-      PG_DATA: /var/lib/postgresql/data
     volumes:
       - pgdata:/var/lib/postgresql/data
     ports:

docker/docker-compose.prod.yml

@@ -85,7 +85,6 @@ services:
       POSTGRES_PASSWORD: ${DB_PASSWORD}
       POSTGRES_USER: ${DB_USERNAME}
       POSTGRES_DB: ${DB_DATABASE_NAME}
-      PG_DATA: /var/lib/postgresql/data
     volumes:
       - pgdata:/var/lib/postgresql/data
     restart: always

docker/docker-compose.test.yml

@@ -37,7 +37,6 @@ services:
       POSTGRES_PASSWORD: ${DB_PASSWORD}
       POSTGRES_USER: ${DB_USERNAME}
       POSTGRES_DB: ${DB_DATABASE_NAME}
-      PG_DATA: /var/lib/postgresql/data
     volumes:
       - /var/lib/postgresql/data
     networks:

docker/docker-compose.yml

@@ -69,7 +69,6 @@ services:
       POSTGRES_PASSWORD: ${DB_PASSWORD}
       POSTGRES_USER: ${DB_USERNAME}
       POSTGRES_DB: ${DB_DATABASE_NAME}
-      PG_DATA: /var/lib/postgresql/data
     volumes:
       - pgdata:/var/lib/postgresql/data
     restart: always