feat(jetbrains): add plugin pre-installation support

[Excellencedev]

Description

This PR implements plugin pre-installation capability for the JetBrains IDE module, addressing issue #208.

Summary

Adds the ability to automatically install JetBrains plugins in workspaces through a new plugins parameter. Plugins are installed at workspace startup using each IDE's native CLI installPlugins command.

Changes

New Features:

• Added plugins variable to accept a list of JetBrains plugin IDs
• Added plugin_install_args variable for additional CLI arguments
• Created install-plugins.sh script that installs plugins using IDE CLI
• Added coder_script resource that runs plugin installation on workspace startup

Documentation:

• Updated README with plugin pre-installation examples
• Added instructions for finding plugin IDs on JetBrains Marketplace
• Included note about Toolbox compatibility

Tests:

• Added 4 new Terraform test cases for plugin functionality
• All 18 tests passing

Example Usage

module "jetbrains" {
  count    = data.coder_workspace.me.start_count
  source   = "registry.coder.com/coder/jetbrains/coder"
  version  = "1.3.0"
  agent_id = coder_agent.example.id
  folder   = "/home/coder/project"
  default  = ["IU", "PY"]

  plugins = [
    "com.intellij.plugins.terminal",
    "org.rust.lang",
    "com.github.copilot",
  ]
}

Compatibility

• Works with JetBrains Toolbox (v2.7+)
• Works with standalone IDE installations
• Handles IDEs not yet installed (installs plugins on first IDE launch)
• Supports all JetBrains IDEs (IntelliJ, PyCharm, GoLand, etc.)

Testing

Verified with:

• terraform init -upgrade - Success
• terraform test -verbose - All 18 tests passed
• bun run fmt - Formatting applied

DEMO: https://github.com/user-attachments/assets/31a67080-a5c9-4b0e-835a-cc570759b1d1

/fixes #208
/claim #208

[matifali]

Hi @Excellencedev, the demo should show the plugins already installed in the JetBrains IDE connected to a Coder workspace. Show the Coder, IDE, and installed plugins.

[Excellencedev]

Hi @Excellencedev, the demo should show the plugins already installed in the JetBrains IDE connected to a Coder workspace. Show the Coder, IDE, and installed plugins.

No problem. Give me a while