Add ability to declare default values for env vars in pyproject.toml #30
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This is something I found necessary for my own use case. It allows similar semantics to
?=
variable assignment in make.Setting an env var to a table with key default means the variable will only be set if not already provided by a lower precedence source such as the host shell or an env file. e.g.
This PR build on top of #29
Documentation done, feature test TODO.