OpamConfigCommand: avoid capturing the Unix.environment at top level #5174
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This is a continuation of #4111 #4789, this time in OpamConfigCommand, which
captures (via a call to OpamInitDefault.init_config ()) the Unix environment
at startup. This is crucial if opam-client is used as a library that modifies
the environment before execution of opam functionality.
This PR is for the 2.1 branch but should apply cleanly on the main branch as well. Are there plans to continue 2.1, or will that version be abandoned in favour of 2.2?