Implement Flow CLI Command to Generate Docker Image

[seekersoftec]

Task:

1. Create a Utility Function: Develop a separate utility function responsible for generating a Docker image template. This function should handle the following aspects:
   • Base Image Selection: Allow choosing between the latest Nautilus Trader image (ghcr.io/nautechsystems/nautilus_trader:latest) and the latest MetaTrader 5 Terminal image (ghcr.io/fortesenselabs/metatrader5-terminal:latest).
2. Implement CLI Command: Add a new CLI command (flowcli generate image metatrader5_terminal OR flowcli generate image nautilus_trader ) that utilizes the utility function to generate the Docker image template.
3. Template Options: The generated template should be a Dockerfile customized for the chosen base image.

Additional Considerations:

• Error Handling: Implement robust error handling in the utility function to gracefully handle invalid base image selection or potential issues during template generation.
• Documentation: Update project documentation to explain the flowcli generate metatrader command, its usage, options, and how to build the generated Docker image.

Note:

This issue proposes a separate utility function to encapsulate the image generation logic and maintain cleaner separation of concerns in the main server/daemon program. The final implementation might choose to integrate this functionality directly into the CLI command if deemed more suitable.