Pop binary and image name w/ v2+ modules (#1091)

[tgrennan]

I've done very little testing but I think this may fix issue #1091
% ./hack/presubmit.sh
~/github.com/ko-build/ko ~/github.com/ko-build/ko
~/github.com/ko-build/ko

[codecov-commenter]

Codecov Report

Patch coverage: 60.00% and no project coverage change.

Comparison is base (cf3e626) 49.34% compared to head (d4e3cdd) 49.34%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1152   +/-   ##
=======================================
  Coverage   49.34%   49.34%           
=======================================
  Files          44       44           
  Lines        3640     3646    +6     
=======================================
+ Hits         1796     1799    +3     
- Misses       1614     1616    +2     
- Partials      230      231    +1     

Files Changed	Coverage Δ
pkg/build/gobuild.go	57.30% <50.00%> (ø)
pkg/build/strict.go	85.00% <50.00%> (-15.00%)	⬇️
pkg/commands/options/publish.go	40.38% <100.00%> (ø)

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[github-actions]

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