feat: add instructions for deploying using docker-compose

[sujithrpillai]

feat(docker-compose): add Docker compose for GenAI toolkit.

Hi @kurtisvg,

Created a Docker-compose for genai-toolkit.

The update includes,

1. config/init.sql - A sample Postgres init SQL , that will bring up -a Postgres DB with pre-populated sample table.
2. config/tools.yaml - A sample tools yaml file for initialising the genai-toolbox with the sample Postgres db queries.
3. docker-compose.yml - Docker compose file with genai-toolbox and Postgres DB.
4. docs/en/how-to/deploy_toolbox_docker.md - Documentation that describes the deployment to docker environments with docker-compose.

Solution to issue #288

[kurtisvg]

/gcbrun

[kurtisvg]

Rather follow the directions for a specific tools.yaml (like we do in the quickstart), I think we should keep this example generic (like we did for the Cloud Run page) and have the user provide their own schema and tools.yaml

So it would be good to see the following sections:

• Before you begin
• Configure tools.yaml file
• Deploy using Docker Compose
• Connecting with Toolbox Client SDK

(Feel free to copy the sections from the Cloud Run page where it makes sense!)

[kurtisvg]

@sujithrpillai -- Thanks for opening a PR! Apologies for taking a few days to respond -- Monday was a holiday in the US.

Let me know if you have any questions!