ci(*:skip) Add new Docker codeowners

[Robert-Steiner]

Issue

Description

Adds @Moep90 and @Robert-Steiner as codeowners for 'src/docker'

Related issues/PRs

Proposal

Explanation

Checklist

• [ ] Implement proposed change
• [ ] Write tests
• [ ] Update documentation
• [ ] Make CI checks pass
• [ ] Ping maintainers on Slack (channel #contributions)

Any other comments?