Support GC.compact

[mperham]

Ruby 2.7 introduces a new compacting GC. Call GC.compact in sidekiqswarm before forking in order to minimize fragmentation and maximize the CoW memory savings.

[yogeshjain999]

Is it possible to support conditionally running GC.compact, same as preloading ?

We're facing one issue when the compaction is ran (occurs randomly), but it needs more debugging. I'm wondering if we can skip the compaction until then but keep using sidekiqswarm.

Thanks 🍻

[mperham]

@yogeshjain999 Ruby is mutable. You can monkeypatch.