make: generate auto-completion files

[rst0git]

This pull request extends the Makefile with targets to generate, install, and uninstall auto-completion files.

[github-actions]

Test Results

49 tests  ±0   49 ✅ ±0   1s ⏱️ ±0s
 1 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit b76a390. ± Comparison against base commit d132ca0.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Attention: 102 lines in your changes are missing coverage. Please review.

Comparison is base (9aa0386) 78.85% compared to head (b76a390) 78.67%.
Report is 13 commits behind head on main.

Files	Patch %	Lines
internal/json.go	66.66%	58 Missing and 20 partials ⚠️
internal/utils.go	66.00%	12 Missing and 5 partials ⚠️
cmd/memparse.go	90.41%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   78.85%   78.67%   -0.19%     
==========================================
  Files           6        9       +3     
  Lines         927     1158     +231     
==========================================
+ Hits          731      911     +180     
- Misses        154      185      +31     
- Partials       42       62      +20     

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[adrianreber]

Do we need to keep the generated files in the repository?

[rst0git]

Do we need to keep the generated files in the repository?

I used an approach similar to Podman (https://github.com/containers/podman/tree/main/completions); it simplifies the installation process. With this approach we don't need to generate the auto-completion files every time we build/install checkpointctl, but we can use make completions to update them.

[adrianreber]

I kind of like it to have information about the completion in the main README file. No need from my side to move it somewhere else. Besides that, this looks good.