Allow crane edit to generate non-image artifacts

[jonjohnsonjr]

Instead of using mutate, just do this ourselves to allow for arbitrary config file contents rather than mutating the OCI config struct.

[imjasonh]

I'm not super convinced we need to do more work to enable crane to produce invalid configs. Can this just live in a fork and not be supported behavior in crane?

[codecov-commenter]

Codecov Report

Merging #1545 (8b2fbca) into main (11843ba) will decrease coverage by 0.02%.
The diff coverage is 54.54%.

@@            Coverage Diff             @@
##             main    #1545      +/-   ##
==========================================
- Coverage   73.31%   73.29%   -0.02%     
==========================================
  Files         117      117              
  Lines        9015     9032      +17     
==========================================
+ Hits         6609     6620      +11     
- Misses       1746     1750       +4     
- Partials      660      662       +2     

Impacted Files	Coverage Δ
internal/cmd/edit.go	53.48% <54.54%> (+0.63%)	⬆️

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[jonjohnsonjr]

I have re-framed the change in terms of more generic usefulness.

[imjasonh]

Now this I can get behind! 😍