environment.yml: handle variant and newer condas better #1334
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Be smarter about alternate builds of conda, set channel-priority to handle if user/distro has set it to something else.
This is an attempt to improve on the install issues seen with #1332
Note that the
channel_priority: true
may seem wrong, but it's a ternary value, with false meaning disabled, true meaning flexible, and strict (a new value) meaning strict. We don't want strict, at least as long as we need tensorflow on Windows. Flexible should do the job.