janitor: revert back to docker for now

Jelmer Vernooijrequested to merge
jelmer/jenkins.debian.net:revert-to-docker into master

janitor: revert back to docker for now.

schroot inside podman doesn't work well enough; hopefully we can revert the revert later...

This reverts commit 6f620c22.

Signed-off-by: Jelmer Vernooij jelmer@jelmer.uk

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