Allow distinct environments for different architectures

Modify the envs subpackage so that instead of just simple conda environments we have a dict "arch -> environment".

assigned to @clemenci

mentioned in merge request lhcb-core/nightly-builds/lb-nightly-rpc!55

added 1 commit

• 5bb05976 - Require LbNightlyTools 4.x

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mentioned in merge request !1038 (closed)

added 1 commit

• 70fa2527 - Add printout of env-hashed.yaml in list-environments

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marked this merge request as ready

mentioned in commit 28a5ab81

merged