perf: fix cpu usage in cache #2264

Job	Run time
Common checks	49s
Build ILC (src, refs/pull/626/merge)	6m 19s
Build Registry (src, refs/pull/626/merge)	19s
Build ILC (dest, master)	8m 39s
Run E2E tests (mysql, mysql, 3306)	3m 54s
Build Registry (dest, master)	15s
Run E2E tests (pg, postgres, 5432)	3m 56s
Test Registry (src, refs/pull/626/merge, sqlite3)	1m 21s
Test Registry (src, refs/pull/626/merge, mysql, mysql, 3306)	1m 30s
Test Registry (src, refs/pull/626/merge, pg, postgres, 5432)	1m 31s
Test Registry (dest, master, sqlite3)	1m 25s
Test Registry (dest, master, mysql, mysql, 3306)	1m 24s
Test Registry (dest, master, pg, postgres, 5432)	1m 28s
Push images to registry	13s
PR Coverage Report	36s
Build documentation	0s
	33m 39s

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