Hopefully fix postgres healthcheck

Author: XanderVertegaal

docker-compose.yml

@@ -20,7 +20,7 @@ services:
             - POSTGRES_PASSWORD=$POSTGRES_PASSWORD
             - POSTGRES_DB=$POSTGRES_DB
         healthcheck:
-            test: ["CMD-SHELL", "pg_isready", "-U", "$POSTGRES_USER", "-d", "$POSTGRES_DB"]
+            test: ["CMD-SHELL", "pg_isready -U $POSTGRES_USER -d $POSTGRES_DB"]
         volumes:
             - postgres-data:/var/lib/postgresql/data
         ports: