allow non-flake builds with flake-enabled nixnonflake-build-flag

This adds a --file option, which causes deploy-rs to always use its
non-flake logic. Before this change, we would ask nix if it understood
flakes, and only if not fall back to the non-flake logic. This has
utility assuming one has a nix flake repository with flake-compat set
up, but prevents use with alternative source-managing tools such as niv
or npins if nix has the "flakes" experimental feature enabled.

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