Update docs and script to 2.11.5-SNAPSHOT (#5904) #1591

Job	Run time
scan	7m 17s
database-tests (ORACLE)	5m 23s
database-tests (DB2)	7m 6s
build	26m 12s
Build and Publish Images / Prepare Job	10s
Build and Publish Images / Build extra images	31s
Build and Publish Images / Publish (spring-cloud-dataflow-server, spring-cloud-dataflow-server/target, springcloud/spring-cl...	3m 4s
Build and Publish Images / Publish (spring-cloud-dataflow-tasklauncher-sink-rabbit, spring-cloud-dataflow-tasklauncher/sprin...	1m 54s
Build and Publish Images / Publish (spring-cloud-dataflow-single-step-batch-job, spring-cloud-dataflow-single-step-batch-job...	2m 56s
Build and Publish Images / Publish (spring-cloud-dataflow-composed-task-runner, spring-cloud-dataflow-composed-task-runner/t...	2m 12s
Build and Publish Images / Publish (spring-cloud-skipper-server, spring-cloud-skipper/spring-cloud-skipper-server/target, sp...	3m 13s
Build and Publish Images / Publish (spring-cloud-dataflow-tasklauncher-sink-kafka, spring-cloud-dataflow-tasklauncher/spring...	1m 48s
done	1s
	1h 1m 47s

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