Merge pull request #369 from ImreSamu/update_postgis341_improve_doc #481

Job	Run time
Build docker image for 12-3.4 variant default	1m 9s
Build docker image for 12-3.4 variant alpine	3m 36s
Build docker image for 13-3.4 variant default	1m 20s
Build docker image for 13-3.4 variant alpine	3m 48s
Build docker image for 14-3.4 variant default	1m 8s
Build docker image for 14-3.4 variant alpine	3m 38s
Build docker image for 15-3.4 variant default	1m 8s
Build docker image for 15-3.4 variant alpine	3m 40s
Build docker image for 16-3.4 variant default	1m 12s
Build docker image for 16-3.4 variant alpine	3m 43s
Build docker image for 15-master variant default	22m 41s
Build docker image for 16-master variant default	23m 26s
Build docker image for 11-3.3 variant default	1m 27s
Build docker image for 11-3.3 variant alpine	3m 28s
	1h 15m 24s

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