Document setup-ko in README.md

[imjasonh]

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[codecov-commenter]

Codecov Report

Merging #484 (972812b) into main (6447264) will not change coverage.
The diff coverage is n/a.

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  Lines        1848     1848           
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  Hits          982      982           
  Misses        715      715           
  Partials      151      151           

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[halvards]

LGTM. Should we also link to the GHCR docs for connecting the image to the repo, either here or in the actions readme?

[imjasonh]

LGTM. Should we also link to the GHCR docs for connecting the image to the repo, either here or in the actions readme?

I'd really like ko to just detect and do this automatically (#366), and not make it something the user even has to think about. We could document how to do it today (along the lines of #221 (comment)), but eventually it shouldn't be necessary at all.

edit: I guess the GitHub Actions equivalent would be:

ko publish \
  --image-label org.opencontainers.image.source=https://github.com/${{ github.repository }} \
  --image-label org.opencontainers.image.revision=${{ github.sha }} \
   ./cmd/app

[halvards]

Or even ${{ github.server_url }}/${{ github.repository }}, to support GitHub Enterprise users.