add to pipeline compile of trapping and of pdf docs

.gitlab-ci.yml

@@ -30,7 +30,8 @@ building_stage:
       paths:
          - build/cluster/*
          - build/sphere/*
-         #- build/trapping/*
+         - build/trapping/*
+	 - doc/build/*
       exclude:
          - ".git*"
          - ".git/**/*"
@@ -46,6 +47,9 @@ building_stage:
       - cd src
       - echo "Running make ..."
       - make
+      - make docs
+      - cd ../doc/build/latex
+      - make 
 
 running_stage:
    stage: run