add Linux tags to .gitlab-ci.yml

2 jobs for master in 14 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #39851
Linux
test-2.7

00:00:12

failed #39850
Linux
test-3.5

00:00:14

 
Name Stage Failure
failed
test-3.5 Test There is an unknown failure, please try again
      File "/local-hdd/gitlab-runner/builds-1/db2a6fb6/0/adielen/openmesh-python/setup.py", line 56, in build_extension
subprocess.check_call(['cmake', ext.sourcedir] + cmake_args, cwd=self.build_temp, env=env)
File "/usr/lib/python3.5/subprocess.py", line 271, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['cmake', '/local-hdd/gitlab-runner/builds-1/db2a6fb6/0/adielen/openmesh-python', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/local-hdd/gitlab-runner/builds-1/db2a6fb6/0/adielen/openmesh-python', '-DPYTHON_EXECUTABLE=/local-hdd/gitlab-runner/builds-1/db2a6fb6/0/adielen/openmesh-python/bin/python3.5', '-DCMAKE_BUILD_TYPE=Release']' returned non-zero exit status 1

----------------------------------------
Command "/local-hdd/gitlab-runner/builds-1/db2a6fb6/0/adielen/openmesh-python/bin/python3.5 -c "import setuptools, tokenize;__file__='/local-hdd/gitlab-runner/builds-1/db2a6fb6/0/adielen/openmesh-python/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" develop --no-deps" failed with error code 1 in /local-hdd/gitlab-runner/builds-1/db2a6fb6/0/adielen/openmesh-python/
ERROR: Job failed: exit status 1
failed
test-2.7 Test There is an unknown failure, please try again
      File "/local-hdd/gitlab-runner/builds-1/db2a6fb6/1/adielen/openmesh-python/setup.py", line 56, in build_extension
subprocess.check_call(['cmake', ext.sourcedir] + cmake_args, cwd=self.build_temp, env=env)
File "/usr/lib/python2.7/subprocess.py", line 186, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['cmake', '/local-hdd/gitlab-runner/builds-1/db2a6fb6/1/adielen/openmesh-python', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/local-hdd/gitlab-runner/builds-1/db2a6fb6/1/adielen/openmesh-python', '-DPYTHON_EXECUTABLE=/local-hdd/gitlab-runner/builds-1/db2a6fb6/1/adielen/openmesh-python/bin/python2.7', '-DCMAKE_BUILD_TYPE=Release']' returned non-zero exit status 1

----------------------------------------
Command "/local-hdd/gitlab-runner/builds-1/db2a6fb6/1/adielen/openmesh-python/bin/python2.7 -c "import setuptools, tokenize;__file__='/local-hdd/gitlab-runner/builds-1/db2a6fb6/1/adielen/openmesh-python/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" develop --no-deps" failed with error code 1 in /local-hdd/gitlab-runner/builds-1/db2a6fb6/1/adielen/openmesh-python/
ERROR: Job failed: exit status 1