* dockutil 2.0.5 -> 3.0.2
Implement required changes to dockutil to handle newer version of package: 3.0.2
* Add gzip to inputs, remove pbzx as it is unused
* Utilise recommended changes reducing build dependencies and following darwin patterns more closely.
Note; this changeset does maintain the symlinking of $out/usr/local/bin in order to resolve an issue with crashing.
* Apply format/lint with nixfmt
Jay Rovacsek