Improve devcontainer performance

[dotoleeoak]

Describe the problem and solution

Dev container에서 docker mount 대신 내부 volume을 사용하여 성능을 개선합니다. https://code.visualstudio.com/remote/advancedcontainers/improve-performance

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guidelines
• [X] Check that there isn't already an issue