feat: add open-webui module for coder-labs

- Installs Open WebUI via pip (Python 3.11+ required)
- Auto-installs Python 3.11 from deadsnakes PPA if not available
- Configurable port, share level, logging
- Subdomain support for clean URLs

registry/coder-labs/modules/open-webui/README.md

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+---
+display_name: Open WebUI
+description: A self-hosted AI chat interface supporting various LLM providers
+icon: ../../../../.icons/openai.svg
+verified: false
+tags: [ai, llm, chat, web-ui, python]
+---
+
+# Open WebUI
+
+Open WebUI is a user-friendly web interface for interacting with Large Language Models. It provides a ChatGPT-like interface that can connect to various LLM providers including OpenAI, Ollama, and more.
+
+This module installs and runs Open WebUI using Python and pip within your Coder workspace.
+
+## Prerequisites
+
+- **Python 3.11 or higher** (automatically installed from deadsnakes PPA if not present)
+- `pip` package manager
+- `sudo` access (for automatic Python installation if needed)
+- Port 8080 (default) or your custom port must be available
+
+**Note:** If Python 3.11+ is not found, the module will automatically:
+1. Add the deadsnakes PPA repository
+2. Install Python 3.11 with venv and dev packages
+3. Install pip if not available
+
+## Basic Usage
+
+```tf
+module "open-webui" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder-labs/open-webui/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.main.id
+}
+```
+
+## Examples
+
+### Custom Port
+
+Run Open WebUI on a custom port:
+
+```tf
+module "open-webui" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder-labs/open-webui/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.main.id
+  port     = 3000
+}
+```
+
+### Public Sharing
+
+Make Open WebUI accessible to authenticated Coder users:
+
+```tf
+module "open-webui" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder-labs/open-webui/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.main.id
+  share    = "authenticated"
+}
+```
+
+### Custom Log Path and Grouping
+
+```tf
+module "open-webui" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder-labs/open-webui/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.main.id
+  log_path = "/var/log/open-webui.log"
+  group    = "AI Tools"
+  order    = 1
+}
+```
+
+## Features
+
+- 🐍 Pure Python installation (no Docker required)
+- 🔄 Automatic Python 3.11+ installation from deadsnakes PPA
+- 💾 Data stored in `~/.open-webui` directory
+- 🚀 Runs in background as a Python process
+- 📝 Configurable logging
+- 🌐 Subdomain support for clean URLs
+- 🔧 Compatible with various LLM providers (OpenAI, Ollama, etc.)
+
+## Data Persistence
+
+Open WebUI data is stored in `~/.open-webui` directory in your workspace, which includes:
+- User accounts
+- Chat history
+- Settings and configurations
+- Model configurations
+
+## Installation Process
+
+The module automatically handles the installation:
+
+1. **Check Python Version**: Looks for Python 3.11+ (checks python3.13, python3.12, python3.11, python3, python)
+2. **Install Python if Needed**: If not found, installs Python 3.11 from deadsnakes PPA
+3. **Install pip**: Ensures pip is available
+4. **Install Open WebUI**: Installs open-webui package via pip
+5. **Start Server**: Launches Open WebUI on the specified port
+

registry/coder-labs/modules/open-webui/main.tf

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+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    coder = {
+      source  = "coder/coder"
+      version = ">= 2.5"
+    }
+  }
+}
+
+# Add required variables for your modules and remove any unneeded variables
+variable "agent_id" {
+  type        = string
+  description = "The ID of a Coder agent."
+}
+
+variable "log_path" {
+  type        = string
+  description = "The path to log Open WebUI to."
+  default     = "/tmp/open-webui.log"
+}
+
+variable "port" {
+  type        = number
+  description = "The port to run Open WebUI on."
+  default     = 8080
+}
+
+variable "share" {
+  type    = string
+  default = "owner"
+  validation {
+    condition     = var.share == "owner" || var.share == "authenticated" || var.share == "public"
+    error_message = "Incorrect value. Please set either 'owner', 'authenticated', or 'public'."
+  }
+}
+
+variable "order" {
+  type        = number
+  description = "The order determines the position of app in the UI presentation. The lowest order is shown first and apps with equal order are sorted by name (ascending order)."
+  default     = null
+}
+
+variable "group" {
+  type        = string
+  description = "The name of a group that this app belongs to."
+  default     = null
+}
+
+resource "coder_script" "open-webui" {
+  agent_id     = var.agent_id
+  display_name = "open-webui"
+  icon         = "/icon/openai.svg"
+  script = templatefile("${path.module}/run.sh", {
+    LOG_PATH : var.log_path,
+    PORT : var.port,
+  })
+  run_on_start = true
+}
+
+resource "coder_app" "open-webui" {
+  agent_id     = var.agent_id
+  slug         = "open-webui"
+  display_name = "Open WebUI"
+  url          = "http://localhost:${var.port}"
+  icon         = "/icon/openai.svg"
+  subdomain    = true
+  share        = var.share
+  order        = var.order
+  group        = var.group
+}

registry/coder-labs/modules/open-webui/run.sh

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+#!/usr/bin/env sh
+
+# Convert templated variables to shell variables
+# shellcheck disable=SC2269
+LOG_PATH=${LOG_PATH}
+# shellcheck disable=SC2269
+PORT=${PORT}
+
+# shellcheck disable=SC2059
+printf '\033[0;1mInstalling Open WebUI...\n\n'
+
+# Function to check Python version
+check_python_version() {
+  python_cmd="$1"
+  if command -v "$python_cmd" > /dev/null 2>&1; then
+    version=$("$python_cmd" --version 2>&1 | awk '{print $2}')
+    major=$(echo "$version" | cut -d. -f1)
+    minor=$(echo "$version" | cut -d. -f2)
+    if [ "$major" -eq 3 ] && [ "$minor" -ge 11 ]; then
+      echo "$python_cmd"
+      return 0
+    fi
+  fi
+  return 1
+}
+
+# Find suitable Python version
+PYTHON_CMD=""
+for cmd in python3.13 python3.12 python3.11 python3 python; do
+  if result=$(check_python_version "$cmd"); then
+    PYTHON_CMD="$result"
+    echo "✅ Found suitable Python: $PYTHON_CMD ($($PYTHON_CMD --version 2>&1))"
+    break
+  fi
+done
+
+if [ -z "$PYTHON_CMD" ]; then
+  echo "❌ Python 3.11 or higher is not installed"
+  echo ""
+  echo "Installing Python 3.11 from deadsnakes PPA..."
+  
+  # Check if we have sudo access
+  if ! command -v sudo > /dev/null 2>&1; then
+    echo "❌ sudo is not available. Please install Python 3.11+ manually"
+    exit 1
+  fi
+  
+  # Install Python 3.11
+  echo "📦 Adding deadsnakes PPA..."
+  sudo apt-get update -qq
+  sudo apt-get install -y software-properties-common
+  sudo add-apt-repository -y ppa:deadsnakes/ppa
+  sudo apt-get update -qq
+  
+  echo "📦 Installing Python 3.11..."
+  sudo apt-get install -y python3.11 python3.11-venv python3.11-dev
+  
+  PYTHON_CMD="python3.11"
+  echo "✅ Python 3.11 installed successfully"
+fi
+
+# Check if pip is available
+if ! "$PYTHON_CMD" -m pip --version > /dev/null 2>&1; then
+  echo "📦 Installing pip..."
+  curl -sS https://bootstrap.pypa.io/get-pip.py | "$PYTHON_CMD"
+fi
+
+# Check if open-webui is already installed
+if ! "$PYTHON_CMD" -m pip show open-webui > /dev/null 2>&1; then
+  echo "📦 Installing Open WebUI..."
+  "$PYTHON_CMD" -m pip install --user open-webui
+  echo "🥳 Open WebUI has been installed"
+else
+  echo "✅ Open WebUI is already installed"
+fi
+
+# Check if Open WebUI is already running
+if pgrep -f "open-webui serve" > /dev/null; then
+  echo "✅ Open WebUI is already running"
+  exit 0
+fi
+
+echo "👷 Starting Open WebUI in background..."
+echo "Check logs at $LOG_PATH"
+
+# Start Open WebUI
+"$PYTHON_CMD" -m open_webui serve --host 0.0.0.0 --port "$PORT" > "$LOG_PATH" 2>&1 &
+
+# Wait a bit for the server to start
+sleep 2
+
+echo "🥳 Open WebUI is starting!"
+echo "Access it at http://localhost:$PORT"