CI: do not install recommended packages

Signed-off-by: Rémi Duraffort <remi.duraffort@linaro.org>
6 jobs for master in 5 minutes and 10 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #92212
amd64
dispatcher/install/buster

00:03:15

passed #92213
amd64
dispatcher/upgrade/buster

00:03:24

passed #92210
amd64
server/install/buster

00:03:55

passed #92211
amd64
server/upgrade/buster

00:04:33

 
  Publish
skipped #92214
amd64
failure
passed #92215
amd64
success

00:00:36