krops writeDeploy: deploy every flake by a URL Nix can't misread

nixos-rebuild gets generated flakes as path: URLs, but other flakes by
their bare paths, which Nix takes for the enclosing Git work tree, if the
target directory lies in one.  A file source there fails to deploy,
because the work tree doesn't track it.  Every flake gets deployed by a
URL: a Git work tree as git+file:, with submodules if it has any, like
populate refers to it, and anything else as path:.

The path gets resolved on the build target, because Nix refuses URLs
with symlinks on the way, which the target directory may be, and
percent-encoded.

--build-host and --target-host name no user if the target has none,
instead of failing to evaluate.

The deploy test also deploys flakes from file and git sources.  Its
scenarios evaluate without LOGNAME.

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