Check optimal Xms and XmG for Opal

[djuarezgf]

Location:
ccp/modules/datashield-compose.yml
opal:
...
JAVA_OPTS: "-Xms1G -Xmx8G -XX:+UseG1GC -Dhttps.proxyHost=forward_proxy -Dhttps.proxyPort=3128"

Problem:
Check optimal Xms and Xmx for productive bridgeheads