feat: use more universal C.UTF-8 instead of en_US.UTF-8

[fatelei]

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Summary

fix #30620

C.UTF-8 is the standard choice for Docker/container environments, while en_US.UTF-8 is mainly used for desktop applications targeting users in specific countries.

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @fatelei, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on standardizing the locale settings within the Docker environment by transitioning from en_US.UTF-8 to C.UTF-8. This modification aims to enhance the robustness and portability of the application when deployed in containerized settings, ensuring consistent and universally compatible UTF-8 encoding behavior across diverse Docker hosts and distributions.

Highlights

• Standardized Locale Settings: The LANG and LC_ALL environment variables have been updated from en_US.UTF-8 to C.UTF-8 across various Docker configuration files.
• Enhanced Container Compatibility: This change improves the universality and compatibility of the application within containerized environments, as C.UTF-8 is the standard and recommended locale for Docker and similar setups, unlike en_US.UTF-8 which is more specific to desktop applications.

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[gemini-code-assist]

Code Review

This pull request updates the default locale from en_US.UTF-8 to the more universal C.UTF-8 across various Docker configuration files. This is a good improvement for containerized environments to prevent potential encoding issues. The changes are consistent, but I've suggested also setting LC_ALL for the oceanbase service for better robustness and consistency with other parts of the configuration.