[Feature]: Support developing inside of a devcontainer

[Spitfire1900]

Before submitting

• I searched existing issues and did not find a duplicate.
• I am describing a concrete problem or use case, not just a vague idea.

Area

Build, CI, or release tooling

Problem or use case

I want to develop within a ephemeral environment without modifying my host systems' configuration or installed packages.

Proposed solution

Support building and developing t3code inside of a devcontainer

Why this matters

This reduces friction to contribute and provides a consistent environment for development that any contributor should be able to reproduce issues from.

Smallest useful scope

Support building and developing t3code inside of a devcontainer

Alternatives considered

No response

Risks or tradeoffs

No response

Examples or references

No response

Contribution

• I would be open to helping implement this.

[Spitfire1900]

Implemented by #1791