[DX-1143] Docs: add environment variables usage documentation#373

Merged

umair-ably merged 13 commits intomainfrom

feature/update-env-variables-usage-docs

May 1, 2026

Commits on May 1, 2026

docs: add comprehensive environment variables reference and cross-link all docs

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Addressed review comments on env. variables doc by copilot and claude

sacOO7
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Added sections for obtaining API_KEY, Token and Access token

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Split env. variables into General-Usage and Development-Stage-Usage to avoid

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Implemented `ably env` command for environment variables reference

sacOO7
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Fixed env. variables usage as per review comments

sacOO7
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Addressed copilot review comment, simplified env. command example description

sacOO7
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Trimmed env. vars documentation to only whats needed, brief description with examples

sacOO7
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Refactored `ably env` help doc as per review comments for both `ably env`

sacOO7
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Trimmed env. variables documentation and data to keep only essential info

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Revert "Trimmed env. variables documentation and data to keep only essential info"

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Trimmed env. variables documentation while keeping per-variable detail sections

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Updated env integration test to match trimmed minimal reference output

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