feat(shell): add packer.nu (#414)

* feat(shell): add `packer.nu`

* dependency update (#413)

* fix(main): move `packer.nu` step before linux package managers

---------

Co-authored-by: Thomas Schönauer <37108907+DottoDev@users.noreply.github.com>

src/main.rs

@@ -177,6 +177,11 @@ For more information about this issue see https://askubuntu.com/questions/110969
         }
     }
 
+    #[cfg(target_os = "linux")]
+    // NOTE: Due to breaking `nu` updates, `packer.nu` needs to be updated before `nu` get updated
+    // by other package managers.
+    runner.execute(Step::Shell, "packer.nu", || linux::run_packer_nu(&ctx))?;
+
     #[cfg(target_os = "linux")]
     let distribution = linux::Distribution::detect();