fix docker build + change base image

[asmyasnikov]

I hereby agree to the terms of the CLA available at: https://yandex.ru/legal/cla/?lang=en

asmyasnikov@asmyasnikov-x ydb-kubernetes-operator % docker image list | grep cr.yandex/yc/operator
cr.yandex/yc/operator                           alpine        0c43f8693b61   2 minutes ago   56MB
cr.yandex/yc/operator                           scratch       1204c06c2952   4 minutes ago   50.4MB

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Other information