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systemd by default limits the /tmp folder to be 10% of the host memory:
https://github.com/systemd/systemd/blob/6f2cea06bfce6ad99f0ac37ab12af61ef7549fe3/src/shared/mount-util.h#L33
This is problematic to our builds because many toolchains opt to put
build artifacts in /tmp, and expecting the host memory to be 10 times
larger is not optimal or even realistic sometimes.
This MR attempts to enlarge it to 50% memory as the host machine's
default value of /tmp. This should be a fair compromise between being
overly conservative and taking up too much memory to crash the system.
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