Output from https://gerrit.fd.io/r/c/vpp/+/25809

$ cat docs.txt | docker run --log-driver=none -a stdin -a stdout -v /Users/pvinci/vpp:/vpp -i ubuntu:18.04 /bin/bash >ubuntu-18_04.txt
$ cat docs.txt | docker run --log-driver=none -a stdin -a stdout -v /Users/pvinci/vpp:/vpp -i ubuntu:20.04 /bin/bash >ubuntu-20_04.txt

$ cat docs-centos7.txt | docker run --log-driver=none -a stdin -a stdout -v /Users/pvinci/vpp:/vpp -i centos:7 /bin/bash >centos7.txt
$ cat docs-centos8.txt | docker run --log-driver=none -a stdin -a stdout -v /Users/pvinci/vpp:/vpp -i centos:8 /bin/bash >centos8.txt