[TM-258] Switch docker images building to kaniko

Description

Problem: Current configuration of CI requires root shells for building docker inside docker container.

Solution: Switch to kaniko, so we won't need these privileges.

Related issue(s)

https://issues.serokell.io/issue/TM-258

✅ Checklist for your Merge Request

Related changes (conditional)

• Tests (see short guidelines)

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    • README
    • Haddock
    • docs/

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