CI: fix failure when the yaml default format change

Check the dictionary instead of the string as the string can varry.

Signed-off-by: Rémi Duraffort <remi.duraffort@linaro.org>
15 jobs for ci-failures-on-sid in 10 minutes and 50 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #60040
amd64
dispatcher-debian-10

00:03:35

passed #60038
amd64
dispatcher-debian-9

00:03:47

passed #60041
amd64
server-debian-10

00:03:09

passed #60039
amd64
server-debian-9

00:03:39

 
  Analyze
passed #60043
amd64
black

00:00:59

passed #60044
amd64
code_quality

00:00:44

passed #60045
amd64
dockerfiles

00:00:37

passed #60046
amd64
job-schema

00:00:55

passed #60047
amd64
pylint

00:03:05

passed #60042
amd64-dind allowed to fail
sast

00:02:07

 
  Build
passed #60050
amd64
amd64/pkg-debian-10

00:01:21

passed #60049
amd64
amd64/pkg-debian-9

00:01:43

passed #60048
amd64
doc

00:01:20

 
  Docker
passed #60051
amd64-dind
amd64/lava-dispatcher

00:01:12

passed #60052
amd64-dind
amd64/lava-server

00:02:12