docs: update comments in docker/.env.example

[longbingljw]

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Summary

Update comments in docker/.env.example.
close #30515

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 dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @longbingljw, 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 enhancing the documentation within the docker/.env.example file. The changes aim to provide more accurate and comprehensive guidance for users configuring database types and vector stores, particularly by including newly supported options like oceanbase and seekdb and clarifying their setup instructions.

Highlights

• Database Type Comments: Updated the comments in docker/.env.example to reflect that oceanbase and seekdb are now supported database types for DB_TYPE.
• Vector Store Comments: Modified the comments for VECTOR_STORE in docker/.env.example to include seekdb as a supported vector store option.
• OceanBase Configuration Clarification: Improved the clarity of comments regarding OceanBase and seekdb configuration, specifically detailing how to set up OceanBase for both metadata and vector database roles.

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[gemini-code-assist]

Code Review

This pull request updates comments in docker/.env.example to include oceanbase and seekdb as supported database and vector store options, and clarifies the configuration for using OceanBase. The changes are clear and improve the documentation within the environment file. I have one suggestion to improve the formatting and correctness of the list of supported vector stores for better readability and consistency.

[laipz8200]

LGTM