[Bug]: Test container leak

[Abacn]

What happened?

THere are many stale containers generated every day and staged in GCR

• For Java tests, there is a clean up script https://github.com/apache/beam/blob/master/runners/google-cloud-dataflow-java/scripts/cleanup_untagged_gcr_images.sh run after each postcommit. However it seems there is still leftovers
• For Pyhon&Go ARM tests, afaik it does not remove stale container after test run

Also, I am not sure the Python ARM test ever use the container for dataflow tests: it pushes image:

beam/sdks/python/test-suites/dataflow/common.gradle

Line 149 in a221f98

dependsOn ":sdks:python:container:py${pyversion}:docker"

but the later test is not referring the container pushed to GCR, and just uses beam-master one

Issue Priority

Priority: 3 (minor)

Issue Components

• Component: Python SDK
• Component: Java SDK
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• Component: Typescript SDK
• Component: IO connector
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• Component: Google Cloud Dataflow Runner