ci: add basic integration test for pmb

Yes, I know this is crude/basic, but others are welcome to improve it later. I think we need some integration testing asap, and this is better than nothing :D

.ci/integration.sh

@@ -10,12 +10,7 @@ pmaports="$(cd "$(dirname "$0")"/..; pwd -P)"
 # Make sure that the work folder format is up to date, and that there are no
 # mounts from aborted test cases (pmbootstrap#1595)
 echo "Initializing pmbootstrap"
-if ! "yes '' | ./pmbootstrap.py \
-		--details-to-stdout \
-		init \
-		>/tmp/pmb_init 2>&1"; then
-	cat /tmp/pmb_init
-fi
+yes '' | ./pmbootstrap.py --details-to-stdout init
 
 ./pmbootstrap.py work_migrate
 ./pmbootstrap.py config aports "$pmaports"