fix(quay.io): start using quay.io and fix backup push

[brokenpip3]

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Includes docs (if user facing)
• Commit messages follow commit message best practices

See the contribution guide for more details.

Release Notes

Start using quay.io and fix backup build/push

[tomvopat]

@brokenpip3, why is it better to move from Docker Hub to quay.io? Is it personal preference or is there some other reason?

[brokenpip3]

nothing personal obv :)

We need to move from the virtuslab docker org and since in docker you have rate limit by default and that could hit our users and in quay.io you do not have the same issue we agreed with virtuslab maintainers of using quay.io.
Another option could be the github registry but since in the last month we are using quay.io and it's working great I do not see any cons with it.
There is something you are aware that we do not considered?

[tomvopat]

Thanks for explanation! I just wasn't aware of this limitation, so I asked...

[brokenpip3]

make sense :)