docs: document SHELL_VERBOSITY environment variable

[Ahmed-AdelB]

Summary

This PR adds documentation for the SHELL_VERBOSITY environment variable as requested in #7601.

Changes

Added a note to the Global Options section in docs/cli.md that:

• Explains SHELL_VERBOSITY as an alternative to -v/-vv/-vvv flags
• Provides a table showing verbosity levels and their command-line equivalents
• Includes an example usage for CI/CD pipelines

Context

From the issue discussion, @Secrus (maintainer) confirmed:

There is SHELL_VERBOSITY flag that sets up the verbosity level. It should probably be added to docs somewhere.

This feature is inherited from the Cleo library and is particularly useful in environments like dh-poetry where command-line invocation is outside user control.

Closes #7601

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Ahmed Adel Bakr Alderai

Summary by Sourcery

Documentation:

• Add CLI documentation explaining the SHELL_VERBOSITY environment variable, its mapping to verbosity flags, and example usage for scripts and CI/CD pipelines.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Documents the SHELL_VERBOSITY environment variable as an alternative way to control CLI verbosity, including mapping values to existing verbosity flags and providing an example for CI/CD usage.

Flow diagram for choosing verbosity configuration method

flowchart TD
  A[Need_to_change_Poetry_CLI_verbosity] --> B{Can_you_modify_command_line_arguments?}
  B -->|Yes| C[Use_-q_-v_-vv_-vvv_flags]
  C --> D[Run_poetry_command]
  B -->|No| E[Set_SHELL_VERBOSITY_environment_variable]
  E --> F{Desired_verbosity_level}
  F -->|Quiet| G[Set_SHELL_VERBOSITY_to_-1_equivalent_to_-q]
  F -->|Normal| H[Set_SHELL_VERBOSITY_to_0_default]
  F -->|Verbose| I[Set_SHELL_VERBOSITY_to_1_equivalent_to_-v]
  F -->|More_verbose| J[Set_SHELL_VERBOSITY_to_2_equivalent_to_-vv]
  F -->|Debug| K[Set_SHELL_VERBOSITY_to_3_equivalent_to_-vvv]
  G --> L[Run_poetry_command_without_flags]
  H --> L
  I --> L
  J --> L
  K --> L
  D --> M[Observe_output_at_selected_verbosity]
  L --> M

Loading

File-Level Changes

Change	Details	Files
Add documentation note describing SHELL_VERBOSITY as an alternative to verbosity flags, including level mapping and CI/CD example.	Insert a Hugo-style note block under the Global Options section explaining that verbosity can be configured via the SHELL_VERBOSITY environment variable. Add a markdown table mapping SHELL_VERBOSITY numeric values (-1 to 3) to their corresponding CLI verbosity flags and behavior descriptions. Include a shell snippet demonstrating setting SHELL_VERBOSITY=3 in a CI or scripted context before running a poetry command.	docs/cli.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#7601	Document in the official CLI documentation that log verbosity can be configured via an environment variable (SHELL_VERBOSITY), including how its values map to existing verbosity flags.	✅

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[radoering]

I think I would omit the example because in this case you can just use command-line arguments and I hope people who cannot use command-line arguments are able to figure out for themselves how to set an environment variable.