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beam/fetch-mix-deps: replace mixEnv with MIX_ENV
Currently, when fetchMixDeps is executed without mixEnv argument. "mixEnv" envvar is empty at installPhase, instead of having value "prod". This happens because optional attrs values are not included in @attrs variable. Thrus being necessary to replace mixEnv for MIX_ENV, which holds value "prod". Reference: https://github.com/NixOS/nixpkgs/pull/216214#issuecomment-1434737238