[FLINK-37196][docs] Use cp to sync local docs #1567

Job	Run time
Pre-compile Checks / Basic QA	5m 24s
Default (Java 8) / Compile	9m 31s
Default (Java 8) / E2E (group 1)	1h 45m 45s
Default (Java 8) / Test packaging/licensing	35m 9s
Default (Java 8) / E2E (group 2)	2h 11m 36s
Default (Java 8) / Test (module: core)	36m 3s
Default (Java 8) / Test (module: python)	29m 51s
Default (Java 8) / Test (module: table)	36m 2s
Default (Java 8) / Test (module: connect)	19m 43s
Default (Java 8) / Test (module: tests)	48m 3s
Default (Java 8) / Test (module: misc)	45m 51s
	8h 22m 58s

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