Resolve "Usage of GitLab CI Components"

Related issues

Add usage of kaniko container runtime to exchange docker executor.

Acceptance criteria

• Implemented code changes don't diverge from the related issue.
• Only released versions of dependencies are used (i.e. no snapshot versions).
• Pipeline still works.
• GitLab issue is up-to-date.

Proposed squash commit message

Add usage of kaniko container runtime to exchange docker executor for docker build step.

Related to #72