chore: Parameterise binary to docker logic

[PranshuSrivastava]

Related Issue

Parameterise the logic for starting keploy in the docker mode from the binary mode.

Describe the changes you've made

Added a variable to be able to set the url of the directory to pull from.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

[Sarthak160]

LGTM