[bisq-network/bisq] Limit system ram to 4GB (#4048)

[Florian Reimair]

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Might treat some symptoms of #3128, #3657, #3918, #3917, #3686, #3677

OpenJDK assumes total system RAM of 128GB. Setting it to 4GB manually
reduces the greediness of the JVM drastically.

Only after setting the MaxRAM to 1.5GB it finally went into a heap space error. 2GB work fine on my machine.

Proposed strategy: do a full release test with this, see how it goes.

This find is courtesy of @ghubstan https://github.com/bisq-network/bisq/issues/3918#issuecomment-594236960

You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4048

-- Commit Summary --

  * Limits system ram to 4GB
  * Limit for bisq-desktop only

-- File Changes --

    M build.gradle (6)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4048.patch
https://github.com/bisq-network/bisq/pull/4048.diff

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