feat(core): enable prepending jvm flags from docker run

[1fanwang]

Summary

Closes #3401

Testing Done

1. Docker build locally which uses the updated script
2. Docker run locally

➜  ~ docker run -e JVM_PREPEND="-Xmx5g" ac28b181eb77
Found on-demand JVM arguments: -Xmx5g, prepending to JVM args
No arguments found in the configuration, start with default arguments
Running as questdb user
Log configuration loaded from: /var/lib/questdb/conf/log.conf
2023-07-13T23:42:25.817836Z A server-main QuestDB 7.2.2-SNAPSHOT. Copyright (C) 2014-2023, all rights reserved.
2023-07-13T23:42:25.935165Z A server-main OS/Arch linux/arm64 [Vanilla,-1744679816, 64 bits, 4 processors]

3. Verified the java command ran in the contianer

➜  ~ docker ps
CONTAINER ID   IMAGE          COMMAND                  CREATED              STATUS              PORTS                          NAMES
9a2c7cf3ccae   ac28b181eb77   "/docker-entrypoint.…"   About a minute ago   Up About a minute   8812/tcp, 9000/tcp, 9009/tcp   beautiful_lamarr

# cd /proc
# cd 1
# cat cmdline
/app/bin/java-Xmx5g-XX:ErrorFile=/var/lib/questdb/db/hs_err_pid+%p.log-Dout=/var/lib/questdb/conf/log.conf-mio.questdb/io.questdb.ServerMain-d/var/lib/questdb-f# 

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[puzpuzpuz]

@mariusgheorghies could you review this PR?

[1fanwang]

@mariusgheorghies could you review this PR?

Thanks @puzpuzpuz , do you have alternative reviewers in mind? still haven't got a review yet on this.

Thank you!

[puzpuzpuz]

Thanks @puzpuzpuz , do you have a group alternative reviewers in mind? still haven't got a review yet on this.

Thank you!

Terribly sorry for the delay. I'm vacationing this week. Will do my best to review your PR on Monday.

[puzpuzpuz]

@yifanstefanwang thanks for the contribution!