Allow machines reset

[anmazzotti]

Resolves rancher/elemental#526

List of changes:

• Added Reset object to MachineRegistration to customize reset behavior
• Implemented elemental.cattle.io/resettable annotation for MachineInventories that can be reset
• Implemented finalizer handler on MachineInventory, so that a resettable machine will receive a reset plan to be executed
• elemental-system-agent is no longer stopped and will continue to run to apply an eventual reset plan
• Implemented --reset and --install arguments for elemental-register to decouple reset and installation workflows from registration updates
• elemental-register now exploits the passed elemental install --config-urls to inject /oem/registration/config.yaml and /oem/registration/state.yaml into an installed system

[codecov]

Codecov Report

Patch coverage: 56.55% and project coverage change: +2.96% 🎉

Comparison is base (cf023ac) 48.54% compared to head (3bcf68b) 51.50%.

❗ Current head 3bcf68b differs from pull request most recent head b00495b. Consider uploading reports for the commit b00495b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
+ Coverage   48.54%   51.50%   +2.96%     
==========================================
  Files          41       41              
  Lines        5319     5551     +232     
==========================================
+ Hits         2582     2859     +277     
+ Misses       2520     2443      -77     
- Partials      217      249      +32     

Files Changed	Coverage Δ
api/v1beta1/machineinventory_types.go	100.00% <ø> (ø)
pkg/elementalcli/elementalcli.go	0.00% <0.00%> (ø)
pkg/register/register.go	0.00% <0.00%> (ø)
pkg/server/server.go	58.79% <0.00%> (-1.67%)	⬇️
api/v1beta1/zz_generated.deepcopy.go	43.20% <53.33%> (+1.02%)	⬆️
pkg/install/install.go	69.03% <57.62%> (+64.96%)	⬆️
cmd/register/main.go	54.81% <59.57%> (-2.21%)	⬇️
controllers/machineinventory_controller.go	71.19% <76.10%> (+3.58%)	⬆️
controllers/machineselector_controller.go	56.22% <100.00%> (-2.40%)	⬇️
pkg/server/api_registration.go	59.89% <100.00%> (+0.10%)	⬆️
... and 1 more

... and 1 file with indirect coverage changes

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[davidcassany]

Nice job 👍

@anmazzotti I think we already clarified few little things on the chat and already stated some follow up little improvements that can be done later for which we already have issues created.

[fgiudici]

great job!