vlc-ubuntu-bionic: install gnupg1 before using apt-key

1 job for master in 13 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #272522
build

00:00:13

 
Name Stage Failure
failed
build Build
+ echo 'Changed images: '"'"' vlc-ubuntu-bionic'"'"
Changed images: ' vlc-ubuntu-bionic'
+ '[' -d vlc-ubuntu-bionic ]
+ date '+%Y%m%d%H%M%S'
+ DATE=20190416183039
+ docker build -t registry.videolan.org/vlc-ubuntu-bionic:20190416183039 vlc-ubuntu-bionic/
Sending build context to Docker daemon 4.608kB
Error response from daemon: Dockerfile parse error line 22: unknown instruction: ECHO
ERROR: Job failed: exit code 1