Add devcontainer

[eashi]

This pull request dev container setup. This will make it easier to run workshops.

Development Container Setup:

• Dockerfile Creation:

  • Added a Dockerfile to set up a Python 3.11 environment with PostgreSQL client support. (.devcontainer/Dockerfile)

• Devcontainer Configuration:

  • Configured devcontainer.json to define the development environment, including port forwarding, VS Code extensions, and settings for Python development and SQL tools. (.devcontainer/devcontainer.json)

• Docker Compose Setup:

  • Created a docker-compose.yml file to define the services for the application and PostgreSQL database, including volume mounts and network configurations. (.devcontainer/docker-compose.yml)