Enable cache stash/restore in github action builds #40
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With ccache enabled, a cold build that used to take about 40 mins now takes 40 secs (the base case of 100% hit rate).
Before:
https://github.com/facebookexternal/nimble/actions/runs/8841486609/job/24278661118?pr=40
After:
https://github.com/facebookexternal/nimble/actions/runs/8841988087/job/24279928057?pr=40