Set reasonable concurrency levels for pgzip #850
Merged
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pgzip's default is GOMAXPROCS(0)
This is fine for single builds, but we will starve CPU for larger builds. 8 is our max because modern laptops tend to have ~8 performance cores, and large CI machines tend to have ~64 cores.
This gives us near 100% utility on workstations, allows us to do ~8 concurrent builds on giant machines, and uses only 1 core on tiny machines.