Enable common folder ouside of adk-agent for code reusability

[furoTmark]

Is your feature request related to a specific problem?

I have a couple of agents that are in a repo. I can run them via adk web and can deploy them via adk deploy agent_engine, however, I cannot share code between them. This would be really handy for reusing tools and skills in multiple similar agents in the same repo.

Describe the Solution You'd Like

Best scenario, the adk deploy command can validate references and can get all the necessary extra files/folders.
Ok scenario: a predefined common folder that can hold common code automatically picked up during deployment.

Impact on your work

How does this feature impact your work and what are you trying to achieve?
Code reuse: no need to copy-paste the same code across multiple folders.
Code sync keeps the same files in sync.

Willingness to contribute

Are you interested in implementing this feature yourself or submitting a PR?
Yes, with some guidance, glad to help out.
I also looked at the code and for agent engine there is a line on 1130 in cli_deploy.py where the extra folders could be added with a cli option --extra_source_packages

agent_config['source_packages'] = [temp_folder] + **extra_source_packages**

For the Docker version, I think it is even simpler because we would just copy the common folder alongside the agent.

[klateefa]

@furoTmark Thank you for submitting this feature request. It’s currently under review by our team, and I’ll keep you posted on any updates. We appreciate your input!