Jeffrey Salmond 1602b7a561 add environment-awareness to buildcache create (#16580) ... * add buildcache create test * add functionality and test to create buildcache from environment * use env.concretized_user_specs rather than env.roots to get concretized specs, as suggested in review from becker33		2020-06-26 10:01:12 -05:00
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spack	add environment-awareness to buildcache create (#16580)	2020-06-26 10:01:12 -05:00