Ensure jsonschema is kept up to date. #918

Job	Run time
Build melange and add to artifact cache	1m 25s
Build packages (hello-wolfi)	1m 17s
Build packages (glibc)	9m 1s
Build packages (tini)	58s
Build packages (lzo)	50s
Build packages (bubblewrap)	53s
Build packages (gdk-pixbuf)	1m 17s
Build packages (gitsign)	2m 28s
Build packages (guac)	2m 4s
Build packages (mdbook)	3m 19s
Build packages (s3cmd)	1m 9s
Build packages (perl-yaml-syck)	52s
Build packages (xmlto)	1m 9s
Build packages (ncurses)	1m 55s
	28m 37s

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