boot: detect error message in final phase

This commit adds error message detection in the final bootloader-commands action.

Closes: #308
15 jobs for detect-final-error in 19 minutes and 16 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test
passed #88688
amd64
dispatcher-debian-10

00:03:04

passed #88690
amd64
dispatcher-debian-11

00:03:12

passed #88689
amd64
server-debian-10

00:03:44

passed #88691
amd64
server-debian-11

00:05:47

 
  Analyze
passed #88693
amd64
black

00:02:04

passed #88694
amd64
code_quality

00:01:16

passed #88695
amd64
coverage

00:08:52

58.81%
passed #88696
amd64
dockerfiles

00:01:08

passed #88698
amd64
pylint

00:02:41

passed #88692
amd64-dind
sast

00:04:09

passed #88697
amd64
schemas

00:02:03

 
  Build
passed #88700
amd64
debian/10

00:01:20

passed #88699
amd64
doc

00:00:40

passed #88701
amd64-dind
docker-amd64-dispatcher

00:04:14

passed #88702
amd64-dind
docker-amd64-server

00:04:33