fix: utilise correct docker credentials #2288

Job	Run time
Build Registry (src, refs/pull/634/merge)	21s
Build Registry (dest, master)	31s
Common checks	58s
Run E2E tests (mysql, mysql, 3306)	3m 45s
Build ILC (src, refs/pull/634/merge)	1m 39s
Run E2E tests (pg, postgres, 5432)	3m 56s
Build ILC (dest, master)	1m 37s
Test Registry (src, refs/pull/634/merge, sqlite3)	1m 23s
Test Registry (src, refs/pull/634/merge, mysql, mysql, 3306)	1m 27s
Test Registry (src, refs/pull/634/merge, pg, postgres, 5432)	1m 28s
Test Registry (dest, master, sqlite3)	1m 26s
Test Registry (dest, master, mysql, mysql, 3306)	1m 29s
Test Registry (dest, master, pg, postgres, 5432)	1m 30s
PR Coverage Report	33s
Push images to registry	6s
Build documentation	0s
	22m 9s

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