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ARROW-8707: [CI] Docker push fails because of wrong dockerhub credentials

- fix rather bug copy-paste error
- adjust command sequence to pull all images before building

Closes #7109 from kszucs/archery-docker-push

Authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>