Update the docker images to enable postgresql, and document them

26 jobs for postgresql in 7 minutes and 2 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #11814
docker
build:1

00:01:36

22.1%
passed #11815
docker
build:2

00:01:38

22.0%
passed #11816
docker
build:3

00:01:53

22.2%
passed #11817
docker
build:4

00:01:18

17.0%
passed #11818
docker
build:5

00:01:51

22.3%
passed #11819
docker
build:6

00:01:35

22.5%
passed #11820
docker
build:7

00:01:01

22.0%
passed #11813
docker
build:alpine

00:02:54

passed #11812
docker
build:debian

00:01:59

32.1%
passed #11811
docker
build:fedora

00:01:39

21.6%
 
  Test
passed #11824
docker
test:alpine

00:01:42

passed #11821
docker
test:debian

00:02:07

69.5%
passed #11822
docker
test:fedora

00:01:50

85.8%
passed #11825
freebsd
test:freebsd

00:02:34

passed #11823
docker
test:without_udns

00:01:47

85.9%
 
  External
passed #11829
docker
codecov:build:1

00:00:14

passed #11830
docker
codecov:build:2

00:00:14

passed #11831
docker
codecov:build:3

00:00:14

passed #11832
docker
codecov:build:4

00:00:14

passed #11833
docker
codecov:build:5

00:00:13

passed #11834
docker
codecov:build:6

00:00:13

passed #11835
docker
codecov:build:7

00:00:13

passed #11828
docker
codecov:debian

00:00:12

passed #11826
docker
codecov:fedora

00:00:13

passed #11827
docker
codecov:without_udns

00:00:15

manual #11836
docker allowed to fail manual
coverity