[2.9.x] Document flag to use self-signed certificates in DEV and when staging (backport #12563) by @mkurz #3537

Job	Run time	Billable time
Extra variables	1s	0s
Prefetch dependencies and JVMs for caching / Prepare Matrix	1s	0s
Prefetch dependencies and JVMs for caching / { "java": "11" }	38s	0s
Binary Compatibility / JDK 11	4m 12s	0s
Code Style Docs / Prepare Matrix	1s	0s
Code Style / Prepare Matrix	1s	0s
Code Style / { "java": "11" }	2m 31s	0s
Code Style Docs / { "java": "11" }	5m 2s	0s
Publish Local / Prepare Matrix	1s	0s
Docs Tests / Prepare Matrix	1s	0s
Tests / Prepare Matrix	1s	0s
Docs Tests / { "java": "11", "scala": "2.13.x" }	7m 9s	0s
Docs Tests / { "java": "11", "scala": "3.x" }	6m 36s	0s
Tests / { "java": "11", "scala": "2.13.x", "sbt_test_task": "test" }	10m 53s	0s
Tests / { "java": "11", "scala": "3.x", "sbt_test_task": "test" }	10m 58s	0s
Publish Local / { "java": "11" }	6m 2s	0s
Scripted Tests / Prepare Matrix	1s	0s
Scripted Tests / { "java": "11", "scala": "2.13.x", "sbt": "1.9.9", "sbt_steps": "*1of3" }	7m 45s	0s
Scripted Tests / { "java": "11", "scala": "2.13.x", "sbt": "1.9.9", "sbt_steps": "*2of3" }	6m 35s	0s
Scripted Tests / { "java": "11", "scala": "2.13.x", "sbt": "1.9.9", "sbt_steps": "*3of3" }	7m 47s	0s
Scripted Tests / { "java": "11", "scala": "3.x", "sbt": "1.9.9", "sbt_steps": "*1of3" }	8m 31s	0s
Scripted Tests / { "java": "11", "scala": "3.x", "sbt": "1.9.9", "sbt_steps": "*2of3" }	6m 41s	0s
Scripted Tests / { "java": "11", "scala": "3.x", "sbt": "1.9.9", "sbt_steps": "*3of3" }	8m 17s	0s
Finish / Ready To Merge	1s	0s
	1h 39m 46s	0s

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