Add .ko.yaml to base ko container image on golang:1.17

[imjasonh]

$ img=$(ko build ./)
...
$ docker run --rm \
  --volume $(pwd):/src \
  --workdir /src \
  --volume ~/.docker:/root/.docker \
  -e KO_DOCKER_REPO=quay.io/imjasonh \
  ${img} \
  build ./ \
  --sbom=none
...
quay.io/imjasonh/ko-98b8c7facdad74510a7cae0cd368eb4e@sha256:7c4c064d8ca7880b4a98674201b2c5e7c6df7fb536b5f4a470acce1a9f75f14b

(Pushing to quay.io since I don't have it configured to use a cred helper, which makes demonstrating this more annoying -- this also exposed #532, which is why I'm testing with --sbom=none)

When we have the image pushed and tagged in the release we should add documentation for this usage in the README.

[codecov-commenter]

Codecov Report

Merging #533 (0d7648b) into main (2ba70fc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #533   +/-   ##
=======================================
  Coverage   48.16%   48.16%           
=======================================
  Files          42       42           
  Lines        2182     2182           
=======================================
  Hits         1051     1051           
  Misses        954      954           
  Partials      177      177           

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