setup rainix docker

[rouzwelt]

Summary

Do NOT merge before #1

Add rainix docker setup for python price pusher

Rationale

How has this been tested?

• Current tests cover my changes
• Added new tests
• Manually tested the code

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch 2025-09-29-rainix-docker-setup

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}