Fix regression of ARM instance startup

[ethanholz]

Closes #59
This pull request introduces a minor enhancement to support configurable runner architecture and updates the corresponding test cases to reflect this change. The most important changes include adding support for dynamic architecture selection in the clouddeployment.py file and ensuring the test cases validate this new functionality.

Enhancements to runner architecture configuration:

• src/gha_runner/clouddeployment.py: Modified the __post_init__ method to dynamically determine the runner architecture from cloud_params (defaulting to "x64") and pass it to the get_latest_runner_release method.

Updates to test cases:

• tests/test_clouddeployment.py:
  • Updated test_deploy_instance_creation to verify that get_latest_runner_release is called with the correct architecture parameter.
  • Fixed formatting in test_teardown_instance_failure to align the expected output list for readability.
  • Added a blank line for readability in the get_instance_mapping method.

[Copilot]

Pull Request Overview

This PR fixes a regression by enabling dynamic runner architecture selection and updates tests to validate the change.

• Dynamically reads an arch key from cloud_params (defaulting to "x64") in __post_init__
• Passes the chosen architecture to get_latest_runner_release
• Updates tests to assert the new parameter and refactors formatting in teardown tests

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/gha_runner/clouddeployment.py	Added dynamic architecture lookup in __post_init__
tests/test_clouddeployment.py	Enhanced tests to assert architecture arg and improved formatting

Comments suppressed due to low confidence (3)

src/gha_runner/clouddeployment.py:150

• [nitpick] Consider renaming the cloud_params key from 'arch' to 'architecture' for consistency with the parameter name and improve clarity.

        architecture = self.cloud_params.get("arch", "x64")

src/gha_runner/clouddeployment.py:140

• Update the docstring of post_init to document the new cloud_params key 'arch' and explain how it controls runner architecture selection.

    def __post_init__(self):

tests/test_clouddeployment.py:77

• Add a test case for a non-default architecture value to ensure custom 'arch' values in cloud_params are passed correctly to get_latest_runner_release.

    gh_mock.get_latest_runner_release.assert_called_once_with(

[dwhswenson]

LGTM. Only question is whether it might be worth adding a test with non-default OS/arch, to make sure we can explicitly set it. But I don't see that as a necessary blocker, just a potential improvement.