Add a `passAlias` to `gopass` derivation, similarly to how there's `viAlias` parameter supported by vim/neovim derivations.
Apart from convenience this is also necessary for e.g. making `docker-credential-helpers` work without patching the latter - the package uses `pass` executable from `PATH` f78081d1f7/pass/pass_linux.go (L67). By setting `passAlias` to `true` (e.g. via overlays like so: 94971f34db/nixpkgs/overlays.nix (L315-L317)), secure Docker authentication via `gopass` "just works"™
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