Create simple 'push-to' shell function

flake.nix

@@ -338,6 +338,16 @@
             writeScriptBin "all-hosts" ''
               nix eval --json .#nixosConfigurations --apply builtins.attrNames 2>/dev/null | jq -r .[]
             '')
+          (with pkgs;
+            writeScriptBin "push-to" ''
+              if [ -z $2 ]; then
+                echo "Need 'switch|boot|...'"
+                exit 1
+              fi
+              host=$1
+              action=$2
+              nixos-rebuild --flake .#$host --build-host root@$host --target-host root@$host $action
+            '')
           (with pkgs;
             writeScriptBin "option" ''
               host=$1