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nix-env can read priorities from a derivations meta attributes, but this only works when installing a nix expression. nix-env can also install bare store paths, however meta attributes are not readable in that case. This means that a store path can not be installed with a specific priority. Some cases where it is advantageous to install a store path: a remote host following a `nix copy`, or any time you want to save some evaluation time and happen to already know the store path. This PR addresses this shortcoming by adding a --priority flag to nix-env --install.