Docker pull rate limit causes most qemu jobs to fail

[r-c-n]

Example: https://lava.collabora.dev/scheduler/job/8290240#L178

Calling: 'nice' 'docker' 'pull' 'kernelci/staging-qemu'
>> Using default tag: latest
>> Error response from daemon: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit
Returned 1 in 1 seconds
Unable to run 'nice' '['docker', 'pull', 'kernelci/staging-qemu']'
Unable to run 'nice' 'docker' 'pull' 'kernelci/staging-qemu'
end: 2.1.1 execute-qemu (duration 00:00:01) [common]
case: execute-qemu
case_id: 285644987
definition: lava
duration: 1.18
extra: ...
level: 2.1.1
namespace: common
result: fail
boot-qemu-image failed: 1 of 1 attempts. 'Unable to run 'nice' 'docker' 'pull' 'kernelci/staging-qemu''
Stopping the qemu container lava-docker-qemu-8290240-2.1.1-f27m0j9j3i
Unable to run 'nice' 'docker' 'pull' 'kernelci/staging-qemu'
end: 2.1 boot-qemu-image (duration 00:00:01) [common]
case: boot-qemu-image
case_id: 285644988
definition: lava
duration: 1.21
extra: ...
level: 2.1
namespace: common
result: fail
boot-image-retry failed: 1 of 1 attempts. 'Unable to run 'nice' 'docker' 'pull' 'kernelci/staging-qemu''
Stopping the qemu container lava-docker-qemu-8290240-2.1.1-f27m0j9j3i
Unable to run 'nice' 'docker' 'pull' 'kernelci/staging-qemu'
end: 2 boot-image-retry (duration 00:00:01) [common]
case: boot-image-retry
case_id: 285644989
definition: lava
duration: 1.24
extra: ...
level: 2
namespace: common
result: fail

Most qemu jobs are failing due to this, although the failed tests are being reported as regressions.

[gctucker]

See also #141

[padovan]

Old issue. (also we are not tracking kernel test failure/issues through GitHub anymore)