Make crane flatten work with indexes

[jonjohnsonjr]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1105 (ffcca26) into main (bea59b9) will decrease coverage by 0.28%.
The diff coverage is 65.59%.

@@            Coverage Diff             @@
##             main    #1105      +/-   ##
==========================================
- Coverage   75.44%   75.16%   -0.29%     
==========================================
  Files         108      108              
  Lines        7692     7722      +30     
==========================================
+ Hits         5803     5804       +1     
- Misses       1334     1363      +29     
  Partials      555      555              

Impacted Files	Coverage Δ
pkg/v1/remote/index.go	71.35% <0.00%> (-12.20%)	⬇️
pkg/crane/options.go	85.71% <80.00%> (-4.29%)	⬇️
pkg/crane/copy.go	60.00% <88.88%> (ø)
pkg/crane/catalog.go	100.00% <100.00%> (ø)
pkg/crane/delete.go	100.00% <100.00%> (ø)
pkg/crane/digest.go	67.85% <100.00%> (ø)
pkg/crane/get.go	100.00% <100.00%> (ø)
pkg/crane/list.go	100.00% <100.00%> (ø)
pkg/crane/manifest.go	100.00% <100.00%> (ø)
pkg/crane/optimize.go	74.69% <100.00%> (ø)
... and 3 more

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