Update main.py system prompt

[Marviel]

System prompt should be passed through

[github-actions]

@Marviel Thanks for your contributions!

The pull request seems to be incomplete as it only includes changes to the main.py file and the test.yaml file. The title of the pull request suggests that the main.py system prompt is being updated, but there is no explanation of what the new system prompt is or why it is being updated. The body of the pull request also lacks context and explanation.

Suggestions:

• Provide a more descriptive title that explains the changes being made in the pull request.
• Add a detailed description in the body of the pull request that explains the changes being made and why they are necessary.
• Include changes to all relevant files in the pull request.
• Provide more information about the new system prompt being added to main.py.