Add Python docs linter #716

Job	Run time
Build melange and add to artifact cache	2m 10s
Build packages (hello-wolfi)	1m 39s
Build packages (glibc)	14m 51s
Build packages (tini)	41s
Build packages (lzo)	1m 34s
Build packages (bubblewrap)	48s
Build packages (gdk-pixbuf)	1m 51s
Build packages (gitsign)	3m 35s
Build packages (guac)	3m 54s
Build packages (mdbook)	5m 24s
Build packages (s3cmd)	50s
Build packages (perl-yaml-syck)	1m 25s
Build packages (xmlto)	59s
Build packages (ncurses)	2m 32s
	42m 13s

Provide feedback