fix: pushing all docker tags on build --push

[miki725]

• Followed the steps in the contributor's guide: https://crashoverride.com/docs/other/contributing#filing-the-pull-request
• PR title uses semantic commit messages
• Filled out the template to a useful degree

Issue

chalk docker build -t foo -t bar --push .

this would only push foo tag and not push bar tag

Description

When specifying multiple tags during docker build, all tags are pushed to the registry when --push flag is used.

Testing

➜ make tests args="test_docker.py::test_multiple_tags --logs"