Fix daily native build by limiting Java heap used and spread load in matrix #1523
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Summary
IIUC https://www.graalvm.org/latest/reference-manual/native-image/optimizations-and-performance/MemoryManagement/ it says that GC also needs 2x of the maximum heap size is the worst case and https://quarkus.io/guides/native-reference says minimum allowed is 4 GB.
So this PR might slower down native CI execution, but GH runners seems weak, I suggest to try it and optimize based on results.
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