Use small shell-based plugin for integration tests instead of konfig

[corneliusweig]

The integration tests in krew need to install a real plugin from the krew index. This needs to be small, so that the tests do not need to download large blobs for each run.

Currently, krew uses konfig for that. However, konfig creates a dedicated dist archive for distribution and does not use the repo tarball which is created automatically for github releases. This is ok, but github keeps track of download counts for release assets. As we run our tests often, this distorts the download numbers of konfig quite a bit. It would be better to switch to a small plugin which is distributed purely as repo tarball, for example ctx.

[corneliusweig]

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[chriskim06]

I'd like to work on this!

/assign

[corneliusweig]

Great! If you have questions, you can also reach out on slack or post here.