Enable Gitlab CI for Linux

This needs special handling for the large auto-generated data tables to
keep the runtime of the static checks manageable.

.gitlab-ci.yml

@@ -3,3 +3,4 @@
 
 include:
   - https://invent.kde.org/sysadmin/ci-tooling/raw/master/invent/ci-reuse.yml
+  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/linux.yml

.kde-ci.yml

@@ -5,3 +5,7 @@ Dependencies:
 - 'on': ['@all']
   'require':
     'frameworks/extra-cmake-modules': '@stable'
+
+Options:
+  # exlucde large generated files from cppcheck, takes way to long to run
+  cppcheck-arguments: '-i src/lib/knowledgedb/linemetadata_data.cpp -i src/lib/knowledgedb/linemetadata.cpp --enable=warning,style,performance'