Merge branch 'feature/configurable-pack-extensions' into 'develop'

Make default pack extensions configurable and default to png and gif

See merge request !1338
14 jobs for develop in 43 minutes and 19 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #40529
build

00:01:02

passed #40530
docs-build

00:01:21

 
  Test
passed #40534
analysis

00:02:06

passed #40533
lint

00:01:57

passed #40531
unit-testing

00:05:18

81.2%
passed #40532
unit-testing-rum

00:05:26

 
  Deploy
passed #40535
docs-deploy

00:00:45

manual #40536
allowed to fail manual
stop_review_app
 
  Release
passed #40537
amd64

00:02:37

passed #40538
amd64-musl

00:03:14

passed #40539
arm32
arm

00:15:53

passed #40540
arm32
arm-musl

00:19:52

passed #40541
arm
arm64

00:05:38

passed #40542
arm
arm64-musl

00:07:52