Set heap size flags in nomulus start script

[jicelhay]

With these changes we are explicitly setting heap sizes in relation to container's memory limit.

Max heap was defaulting to 25%, which isn't optimal for our settings (one-ish app per container).

b/468369756

---

This change is 

[CydeWeys]

@CydeWeys made 1 comment.
Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @jicelhay).

---

jetty/start.sh line 31 at r1 (raw file):

esac
java $PROFILER_ARGS \
    -XX:InitialRAMPercentage=50.0 \

Add a comment here explaining the reasoning behind 50%? (In particular, how we only run 1 Java instance per container, or whatever the exact finding was.)

[CydeWeys]

@CydeWeys reviewed 1 file and all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @jicelhay).

[jicelhay]

@jicelhay resolved 1 discussion.
Reviewable status: 0 of 1 files reviewed, all discussions resolved (waiting on @CydeWeys).

[CydeWeys]

@CydeWeys reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @jicelhay).