feat: Support additional environment variables for Claude CLI configuration

[lroolle]

Summary

Add support for additional environment variables to enhance configuration flexibility and align with Claude CLI's official environment variable support.

Motivation

Currently, our Docker wrapper only handles basic authentication mounting but doesn't expose the full range of environment variables that Claude CLI supports. This limits configurability and forces users to work around missing environment controls.

Proposed Environment Variables

Configuration Management

• CLAUDE_CONFIG_DIR - Override default config directory location
• NODE_ENV - Environment detection for different behaviors
• USER_TYPE - User classification controls
• CI - CI environment detection for automation-friendly behavior

Authentication & API

• ANTHROPIC_API_KEY_OVERRIDE - Override mechanism for API keys
• ANTHROPIC_AUTH_TOKEN - Alternative authentication method
• ANTHROPIC_BASE_URL - Custom endpoint configuration
• ANTHROPIC_MODEL - Default model selection
• API_TIMEOUT_MS - Request timeout configuration

Cloud Provider Integration

• CLAUDE_CODE_USE_BEDROCK - AWS Bedrock toggle
• CLAUDE_CODE_USE_VERTEX - Google Vertex AI toggle
• CLOUD_ML_REGION - Cloud region specification
• VERTEX_REGION_CLAUDE_ - Vertex region prefix

Feature Toggles

• DISABLE_PROMPT_CACHING - Cache control
• DISABLE_BINARY_FEEDBACK - Feedback system control
• FORCE_BINARY_FEEDBACK - Force feedback mode
• MAX_THINKING_TOKENS - Token limits
• THINK_TOOL - Enable thinking tool
• USE_BUILTIN_RIPGREP - Ripgrep preference
• USE_STAGING_OAUTH - OAuth environment selection

Implementation

1. Update claude.sh to pass through these environment variables to the Docker container
2. Update Dockerfile to ensure environment is properly configured
3. Add documentation to README about supported environment variables
4. Add examples showing how to use environment-based configuration

Benefits

• Better CI/CD integration with CI and NODE_ENV detection
• Flexible config directory placement with CLAUDE_CONFIG_DIR
• Enhanced cloud provider configuration
• Fine-grained feature control
• Improved timeout and caching controls

[rindc]

@claude add CLAUDE_CONFIG_DIR

[lroolle]

Closing this as resolved. Deva now supports generic -e VAR[=VALUE] passthrough plus the current auth and provider env vars used by Claude, Codex, and Gemini, including custom endpoint envs.