Align build steps - distinguish clean vs dev builds

[jotak]

• Reducing the Dockerfile dependencies allows faster dev builds
• Optimize docker caching wrt oc-commands dependencies
• Align also with other repos wrt build date / version (it was not correctly implemented, with variable names mismatch)
• Remove duplicated "make build" definitions

[openshift-ci]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 26.00%. Comparing base (0398f3b) to head (49eb8b2).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
main.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
+ Coverage   25.08%   26.00%   +0.92%     
==========================================
  Files           8        8              
  Lines        1148     1315     +167     
==========================================
+ Hits          288      342      +54     
- Misses        839      952     +113     
  Partials       21       21              

Flag	Coverage Δ
unittests	26.00% <0.00%> (+0.92%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
main.go	0.00% <0.00%> (ø)

... and 7 files with indirect coverage changes

[github-actions]

New image:
quay.io/netobserv/network-observability-cli:76ad8dd

It will expire after two weeks.

To use this build, update your commands using:

USER=netobserv VERSION=76ad8dd make commands

or download the updated commands.

[jpinsonneau]

Move that one after the collector build

[jotak]

done: 49eb8b2