[Bug]: Image and content stores don't honor custom app-data path.

[jglogan]

I have done the following

• I have searched the existing issues
• If possible, I've reproduced the issue using the 'main' branch of this project

Steps to reproduce

While running tests, I noticed that if I removed all data and ran a fresh integration test with a custom app-data path, the image and content store data still went to the default path ~/Library/Application Support/com.apple/container.

Current behavior

container system stop
sudo uninstall-container.sh -d
rm -rf "${PWD}/test-data"
mkdir "${PWD}/test-data"
make APP_ROOT="${PWD}/test-data" all test integration

% ls "${PWD}/test-data" ~/Library/Application\ Support/com.apple.container
 % ls "${PWD}/test-data" ~/Library/Application\ Support/com.apple.container
.../Library/Application Support/com.apple.container:
content		snapshots	state.json

.../container/test-data:
apiserver	builder		containers	kernels		networks	plugin-state	volumes

Expected behavior

Imageref store state.json, content store content, and snapshot store snapshots should be in test-data. The default application data directory should not exist.

Environment

- OS: 26
- Xcode: 26
- Container: main

Relevant log output

N/A

Code of Conduct

• I agree to follow this project's Code of Conduct