feat: add Docker support for all MCP servers

- Create individual Dockerfiles for each of the 7 MCP servers
- Add docker-compose.yml for orchestrating all services
- Create build-docker.sh script for easy container building
- Add comprehensive Docker deployment documentation (DOCKER.md)
- Update main README with Docker installation instructions
- Add .env.example template for environment configuration
- Configure each server with dedicated ports (3000-3006)
- Implement security best practices (non-root user, minimal base image)
- Add production deployment considerations and troubleshooting guide

Each server can now be run individually or all together using Docker Compose,
making deployment and scaling much easier for production environments.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

docker/Dockerfile.environments

@@ -0,0 +1,33 @@
+# Dockerfile for Portainer Environments MCP Server
+FROM python:3.11-slim AS base
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    git \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Copy requirements and server file
+COPY requirements.txt .
+COPY portainer_environments_server.py .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Create non-root user
+RUN useradd -m -u 1000 mcp && chown -R mcp:mcp /app
+
+# Switch to non-root user
+USER mcp
+
+# Set Python to unbuffered mode
+ENV PYTHONUNBUFFERED=1
+
+# Expose MCP standard port
+EXPOSE 3001
+
+# Run the server
+CMD ["python", "portainer_environments_server.py"]