Switch to using a managed identity instead of file based credentials for
running kola/ore (not plume). This covers our test subscription, but not our
publishing subscription.
Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
The garbage collect job should also clean up kola resources if a test
job failed to do so due to forced terminator or misbehavior. The
cleanup is done by "ore" which needs credentials like kola.
Run ore from the mantle container image. Unfortunately Docker does not
support Podman's --env-host option and the env vars had to be passed
explicitly. While --env-file=<(env) would work it contains a lot of
variables that cause the container to behave a bit weird.
