Allow overriding FILTER_FLAG in clear-docker-cache script

Axel von Bertoldirequested to merge
avonbertoldi/38647/override-FILTER_FLAG-clear-docker-cache into main

In #38647 (closed) users would like to reuse the clear-docker-cache to delete object that don't match the FILTER_FLAG.

Make it overrideable.

Close #38647 (closed)

Edited by Romuald Atchadé - OOO until Jan 11th, 2026

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