internal/increase-server-memory-limit (DSpace#411)

* Update docker-compose-rest.yml

Increase memory limit to 4GB

* Load JAVA_OPTS from the .env file.

Author: milanmajchrak

docker/docker-compose-rest.yml

@@ -19,6 +19,7 @@ services:
     restart: unless-stopped
     container_name: dspace${INSTANCE}
     environment:
+      JAVA_OPTS: ${JAVA_OPTS:--Xmx4g}
       TZ: ${TIMEZONE:-Europe/Bratislava}
       # Below syntax may look odd, but it is how to override dspace.cfg settings via env variables.
       # See https://github.com/DSpace/DSpace/blob/main/dspace/config/config-definition.xml