The Python ValidatesContainer Dataflow ARM job is flaky

[github-actions]

The Python ValidatesContainer Dataflow ARM is failing over 50% of the time.
Please visit https://github.com/apache/beam/actions/workflows/beam_Python_ValidatesContainer_Dataflow_ARM.yml?query=is%3Afailure+branch%3Amaster to see all failed workflow runs.
See also Grafana statistics: http://metrics.beam.apache.org/d/CTYdoxP4z/ga-post-commits-status?orgId=1&viewPanel=8&var-Workflow=Python%20ValidatesContainer%20Dataflow%20ARM

[claudevdm]

This looks like the same error as in #30513 (comment)

2024-11-07T00:28:14.5379464Z  125 |     
2024-11-07T00:28:14.5379871Z  126 |     # Python standard library modules.
2024-11-07T00:28:14.5380683Z  127 | >>> COPY --from=base /usr/lib/python${py_version} /usr/lib/python${py_version}
2024-11-07T00:28:14.5381410Z  128 |     
2024-11-07T00:28:14.5381877Z  129 |     # Contains the boot entrypoint and related files such as licenses.
2024-11-07T00:28:14.5382441Z --------------------
2024-11-07T00:28:14.5383497Z ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref op9qbbxiawp35xb9yic5iidtt::7lhx9nqhy3rc7oxsfvnav2psn: "/usr/lib/python3.9": not found

[claudevdm]

This is green after the fix for #30513 (comment)

[claudevdm]

.close-issue

[github-actions]

Reopening since the workflow is still flaky