Create boot_retry variable

Create a boot_retry variable that will performing the same
mechanism than "failure_retry" but only on 'boot' actions.
If "boot_retry" variable is not set, it will use the "failure_retry" one.

Signed-off-by: Mylène Josserand <mylene.josserand@collabora.com>
16 jobs for customize_failure_retry in 16 minutes and 28 seconds (queued for 4 seconds)
latest
Status Job ID Name Coverage
  Test
passed #129508
amd64
dispatcher-debian-10

00:02:28

passed #129510
amd64
dispatcher-debian-11

00:02:36

passed #129509
amd64
server-debian-10

00:02:55

passed #129511
amd64
server-debian-11

00:05:26

 
  Analyze
passed #129512
amd64-dind
bandit-sast

00:01:02

passed #129513
amd64
black

00:00:39

passed #129514
amd64
code_quality

00:00:22

passed #129519
amd64
codespell

00:00:20

passed #129515
amd64
coverage

00:06:43

61.04%
passed #129516
amd64
dockerfiles

00:00:15

passed #129518
amd64
pylint

00:03:08

passed #129517
amd64
schemas

00:00:33

 
  Build
passed #129521
amd64
debian/10

00:01:22

passed #129520
amd64
doc

00:00:38

passed #129522
amd64-dind
docker-amd64-dispatcher

00:04:07

passed #129523
amd64-dind
docker-amd64-server

00:04:14