Cherry-pick #21242 to 7.9: Fix autodiscover flaky tests #21289
Merged
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Cherry-pick of PR #21242 to 7.9 branch. Original message:
Use a tagged image instead of doing an untagged pull, this was pulling all
busybox tags,
busybox:latest
image used now is pre-cached.Better control when the containers are started and stopped, run the
container detached.
Use container name instead of container image for conditions and templates,
better ensuring that we are testing against the proper container.
Move common code to helper function.