GitLab CI/CD: generate pdf documentation

Remove build artifacts from normal builds (libs and executables).
  These were never meant to be provided but forgotten to remove
  after tests.

Try to build fltk.pdf (may be removed later)

Store fltk.pdf in 'public' folder to be available online in docs
  and downloadable as "artifact"

.gitlab-ci.yml

@@ -41,13 +41,6 @@ build-autotools:
     - ./configure --enable-pango --enable-cairo
     - time make -j3
     - cd examples && time make
-  artifacts:
-    paths:
-      - lib/
-      - test/cairo_test
-      - test/glpuzzle
-      - test/unittests
-      - test/fltk-versions
 
 # Build with CMake and Ninja (with pango, cairo, building examples)
 
@@ -70,10 +63,6 @@ build-cmake:
     - date
     - time ninja
     - date
-  artifacts:
-    paths:
-      - build/lib/
-      - build/bin/
 
 # Generate and install HTML documentation
 
@@ -86,7 +75,7 @@ pages:
   # install the necessary build tools
   before_script:
     - date
-    - apt update && apt -y install make autoconf man doxygen
+    - apt update && apt -y install make autoconf man doxygen doxygen-latex
   script:
     - date
     - make clean
@@ -94,9 +83,12 @@ pages:
     - date
     - make && make html
     - date
+    - make pdf
+    - date
     - cd ..
     - mkdir -p public/
     - mv documentation/html/* public/
+    - mv documentation/fltk.pdf public/
     - date
   artifacts:
     paths: