Pin buildah version

[SaschaSchwarze0]

Changes

Our builds started failing during e2e with this failure in the buildah BuildRun:

Logs of container step-buildah-bud:
STEP 1: FROM golang:1.16 AS build
STEP 2: FROM scratch
error creating build container: short-name resolution enforced but cannot prompt without a TTY

Using v1.20.1 seems to work, though I have not found some commit in buildah yet that is problematic.

Submitter Checklist

• Includes tests if functionality changed/was added
• Includes docs if changes are user-facing
• Set a kind label on this PR
• Release notes block has been filled in, or marked NONE

Release Notes

Use buildah v1.20.1 in the sample build strategies

[imjasonh]

containers/buildah#3096 seems to be related FYI

/lgtm

[gabemontero]

Yeah we should avoid latest in general IMO across all the strategies and the images they use (though I have not looked to see if buildah is the only offender)

this is either a good start or the last piece of that solution :-)

/approve

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