adds .gitlab-ci.yml

1 job for master in 12 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
failed #10281
doxygen
pages

00:00:12

 
Name Stage Failure
failed
pages Test

Skipping Git submodules setup
$ apk add make
(1/1) Installing make (4.2.1-r0)
Executing busybox-1.25.1-r0.trigger
OK: 159 MiB in 57 packages
$ ls /usr/bin/perl
ls: /usr/bin/perl: No such file or directory
ERROR: Job failed: exit code 1