WIP: adding OCI output mode as buildctl does

[h4l0gen]

Describe the changes in this pull request using active verbs such as Add, Remove, Replace ... This PR has one little issue it is WIP. I am resolving it by discussion with the maintainers Closes #604

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 1.92308% with 51 lines in your changes are missing coverage. Please review.

Project coverage is 33.03%. Comparing base (2602d59) to head (bcb53a8). Report is 63 commits behind head on main.

Files	Patch %	Lines
pkg/patch/patch.go	0.00%	50 Missing :warning:
pkg/patch/cmd.go	50.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #621      +/-   ##
==========================================
+ Coverage   32.51%   33.03%   +0.52%     
==========================================
  Files          17       18       +1     
  Lines        1621     1553      -68     
==========================================
- Hits          527      513      -14     
+ Misses       1062     1007      -55     
- Partials       32       33       +1     

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[ashnamehrotra]

@h4l0gen are you still working on this issue?

[h4l0gen]

Hi @ashnamehrotra, sorry I am deeply involved in some other project's engagements. Please feel free to assign it to someone who wants to work on it. Again sorry that I am not able to find time ;)

[ashnamehrotra]

@h4l0gen no problem, thank you for getting back to me. I will close this PR for now.