Add .gitlab-ci.yml

1 job for master in 4 minutes and 22 seconds
Status Job ID Name Coverage
  Test
failed #197277
test

00:04:22

 
Name Stage Failure
failed
test Test
Setting up dirmngr (2.2.19-3ubuntu2) ...
Setting up llvm-10-dev (1:10.0.0-4ubuntu1) ...
Setting up clang (1:10.0-50~exp1) ...
Setting up gpg-wks-client (2.2.19-3ubuntu2) ...
Setting up gnupg (2.2.19-3ubuntu2) ...
Processing triggers for libc-bin (2.31-0ubuntu9) ...
$ cd build
/usr/bin/bash: line 94: cd: build: No such file or directory
ERROR: Job failed: exit code 1