feat(cli): add --python_version option to adk deploy commands

[JesserHamdaoui]

Summary

---

1. Link to an existing issue:

• Fixes: Add support for overriding Python version in "adk deploy" commands #4784

Problem:
The Dockerfile template used in adk deploy cloud_run and adk deploy gke hardcoded python:3.11-slim as the base image. This made it impossible to deploy agents that require a newer Python runtime (e.g., 3.12, 3.13) without manually patching the generated Dockerfile.

Solution:
Parameterize the Dockerfile base image by adding a --python_version CLI option to both adk deploy cloud_run and adk deploy gke. The option defaults to "3.11" to preserve existing behavior.

• _DOCKERFILE_TEMPLATE in cli_deploy.py: replaced python:3.11-slim with python:{python_version}-slim.
• to_cloud_run() and to_gke(): added python_version: str = "3.11" parameter, forwarded to the template .format() call.
• cli_deploy_cloud_run and cli_deploy_gke in cli_tools_click.py: added @click.option("--python_version", ...) with default="3.11", forwarded to the deploy functions.

Usage:

# Deploy with Python 3.12
adk deploy cloud_run --python_version 3.12 ./my_agent

# Deploy with Python 3.13
adk deploy gke --python_version 3.13 --cluster_name my-cluster ./my_agent

# Default behavior unchanged
adk deploy cloud_run ./my_agent  # still uses python:3.11-slim

---

Testing Plan

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

Updated 3 existing test files:

• test_cli_deploy_to_cloud_run.py: updated happy path to pass python_version="3.12" and assert FROM python:3.12-slim in the Dockerfile; added test_to_cloud_run_default_python_version to verify the 3.11 default.
• test_cli_deploy.py: updated GKE happy path to pass python_version="3.12" and assert FROM python:3.12-slim.
• test_cli_tools_click.py: added test_cli_deploy_cloud_run_python_version and test_cli_deploy_gke_python_version to verify --python_version is forwarded correctly.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the adk deploy CLI commands by introducing a --python_version option. This allows users to specify the Python runtime version for their agent's Docker image when deploying to Cloud Run or GKE, addressing the previous limitation of a hardcoded Python 3.11 base image. The change provides greater flexibility for agents requiring different Python environments while maintaining existing default behavior.

Highlights

• New CLI Option: Introduced a --python_version option for adk deploy cloud_run and adk deploy gke commands, allowing users to specify the Python runtime version for their agent's Docker image.
• Dockerfile Parameterization: The Dockerfile template used for deployments was updated to dynamically incorporate the specified Python version, replacing the previously hardcoded python:3.11-slim base image.
• Backward Compatibility: The new --python_version option defaults to 3.11, ensuring that existing deployment behaviors remain unchanged if the option is not explicitly provided.
• Unit Test Coverage: Added and updated unit tests to validate the new --python_version functionality, including tests for explicit version setting and the default behavior.

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Changelog

• src/google/adk/cli/cli_deploy.py
  • Modified the _DOCKERFILE_TEMPLATE to use a python_version placeholder.
  • Added python_version parameter to _get_service_option_by_adk_version, to_cloud_run, and to_gke functions with a default of '3.11'.
  • Passed python_version to the Dockerfile template formatting in to_cloud_run and to_gke.
• src/google/adk/cli/cli_tools_click.py
  • Added @click.option("--python_version", ...) to the cli_deploy_cloud_run and cli_deploy_gke commands.
  • Added python_version parameter to cli_deploy_cloud_run and cli_deploy_gke functions.
  • Forwarded python_version from CLI options to the respective cli_deploy functions.
• tests/unittests/cli/utils/test_cli_deploy.py
  • Updated GKE deployment test to pass python_version="3.12" and assert the correct Dockerfile content.
• tests/unittests/cli/utils/test_cli_deploy_to_cloud_run.py
  • Updated test_to_cloud_run_happy_path to pass python_version="3.12" and assert the correct Dockerfile content.
  • Added test_to_cloud_run_default_python_version to verify the default Python 3.11 behavior in the Dockerfile.
• tests/unittests/cli/utils/test_cli_tools_click.py
  • Added test_cli_deploy_gke_python_version to confirm the --python_version CLI option is correctly forwarded to cli_deploy.to_gke.

Activity

• Unit tests were added or updated to cover the new functionality.
• All unit tests pass locally.

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[gemini-code-assist]

Code Review

This pull request adds a --python_version option to the adk deploy commands to allow specifying the Python version for the Docker base image. My review focuses on improving code maintainability and test coverage. I've identified an unused parameter, an opportunity to refactor duplicated code, and a missing unit test. Please see the specific comments for details.

[gemini-code-assist]

This @click.option for --python_version is duplicated for the cli_deploy_gke command as well. To improve maintainability and avoid duplication, consider creating a reusable decorator for this option, similar to how adk_services_options is implemented.

For example:

def python_version_option():
  return click.option(
      "--python_version",
      type=str,
      default="3.11",
      show_default=True,
      help=(
          "Optional. The Python version used in the Docker base image."
          " (default: 3.11)"
      ),
  )

@deploy.command(...)
@python_version_option()
def cli_deploy_cloud_run(...):
  ...

@deploy.command(...)
@python_version_option()
def cli_deploy_gke(...):
  ...

This change would make the code more DRY (Don't Repeat Yourself).

[JesserHamdaoui]

I'm not sure if I should implement this or stick to the existing pattern used for the other flag parameters