docker-container: wait for BuildKit before dialing - #4027
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Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
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fixes #4021
closes #4023
A freshly created
docker-containerbuilder can report as running beforebuildkitdis ready to serve its socket. This can make concurrent first builds fail with dial-stdio or server preface errors, and the cached driver client can make the first transient failure sticky. This change waits for BuildKit readiness before opening the docker-container dial path and only caches successfully created driver clients.