Fix encoding of shared signature

    Add several tests about image sharing
4 jobs for preprod in 2 minutes and 41 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #3106
preprod
unit tests

00:01:18

 
  Deploy
passed #3109
preprod
deploy preprod

00:01:23

failed #3107
preprod
deploy preprod

00:01:14

failed #3108
preprod
deploy preprod

00:01:10