feat: add disable_autoupdater variable to control auto-updates

[DevelopmentCats]

Description

Claude-Code auto-updates itself unless the DISABLE_AUTOUPDATER env is set. This PR adds a disable_autoupdater variable which allows the user to disable claude-code's auto updating feature. This should resolve the issue where claude-code updates itself when a user defines a specific claude-code version to be installed which was confusing for the end user.

Type of Change

• New module
• New template
• Bug fix
• Feature/enhancement
• Documentation
• Other

Module Information

Path: registry/coder/modules/claude-code
New version: v4.2.0
Breaking change: [ ] Yes [X] No

Testing & Validation

• Tests pass (bun test)
• Code formatted (bun fmt)
• Changes tested locally

Related Issues

[Copilot]

Pull Request Overview

This PR adds a new enable_auto_update variable to control whether Claude Code automatically updates itself. By default, auto-updates are now disabled, addressing the confusing behavior where Claude Code would update itself even when users specified a specific version to install.

• Added enable_auto_update boolean variable (default: false) to control auto-update behavior
• Implemented conditional DISABLE_AUTOUPDATER environment variable based on the new setting
• Updated all README examples to reference version 4.2.0

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
registry/coder/modules/claude-code/main.tf	Added enable_auto_update variable and conditional coder_env resource to set DISABLE_AUTOUPDATER when auto-updates are disabled
registry/coder/modules/claude-code/README.md	Updated version references from 4.1.0 to 4.2.0 across all usage examples

Comments suppressed due to low confidence (1)

registry/coder/modules/claude-code/README.md:99

• The new enable_auto_update variable is not documented in the README. Consider adding an example that demonstrates how to use this variable, especially since the PR description mentions that this resolves a confusing issue where claude-code updates itself even when a specific version is pinned. An example showing how to pin a version and disable auto-updates would be helpful:

module "claude-code" {
  source              = "registry.coder.com/coder/claude-code/coder"
  version             = "4.2.0"
  agent_id            = coder_agent.example.id
  workdir             = "/home/coder/project"
  claude_code_version = "1.0.82"
  enable_auto_update  = false  # Ensures Claude Code stays on version 1.0.82
}

  version  = "4.2.0"
  agent_id = coder_agent.example.id
  workdir  = "/home/coder/project"

  claude_api_key = "xxxx-xxxxx-xxxx"
  # OR
  claude_code_oauth_token = "xxxxx-xxxx-xxxx"

  claude_code_version = "1.0.82" # Pin to a specific version
  agentapi_version    = "v0.10.0"

  ai_prompt = data.coder_parameter.ai_prompt.value
  model     = "sonnet"

  permission_mode = "plan"

  mcp = <<-EOF
  {
    "mcpServers": {
      "my-custom-tool": {
        "command": "my-tool-server"
        "args": ["--port", "8080"]
      }
    }
  }
  EOF
}

[matifali]

I think we should keep the default behavior and allow disabling as opt in for the ones who need it.

[DevelopmentCats]

@matifali

I have updated this and you are right it feels much better this way