add a workaround to a Docker (aufs) bug

[jieyu]

You might see the entrypoint script throw out errors like the following:

/usr/bin/mount: Text file busy

This is due to this bug (likely in AUFS):
moby/moby#9547

This patch workarounds it by inserting a sync in between.

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[jieyu]

Just signed CLA.

[aojea]

is AUFS going to be supported moving forward? 🤔
https://docs.docker.com/storage/storagedriver/aufs-driver/#prerequisites

[jieyu]

@aojea From docker site, it still shows supported. Some ubuntu distro still has that as the default (e.g., our CI machines). The workaround looks simple enough. I cannot reproduce the issue after the workaround in our CI.

[aojea]

/ok-to-test

[jieyu]

/assign @BenTheElder

[BenTheElder]

Thanks!
/hold
holding so I don't forget to bump the base image with this change later, unless @munnerz beats me to it. in a summit all day today...

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, jieyu

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.