Fix publishing of the`chain-spec-builder` image #6246

Job	Run time
set-image	5s
check-runtime-migration (asset-hub-westend)	4m 20s
check-runtime-migration (asset-hub-rococo)	5m 43s
check-runtime-migration (bridge-hub-westend)	3m 45s
check-runtime-migration (bridge-hub-rococo)	3m 46s
check-runtime-migration (contracts-rococo)	3m 53s
check-runtime-migration (collectives-westend)	3m 41s
check-runtime-migration (coretime-rococo)	3m 51s
	29m 4s

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