Testing CI with multiple ubuntu releases

.gitlab-ci.yml

-image: labrobotica/ceres:1.14
-
-before_script:
-  - ls
-  - apt-get update
-  - apt-get install -y build-essential cmake 
-
-# SPDLOG
-#  - apt-get install -y libspdlog-dev
-  - if [ -d spdlog ]; then
-  -   echo "directory exists" 
-  -   if [ "$(ls -A ./spdlog)" ]; then 
-  -     echo "directory not empty" 
-  -     cd spdlog
-  -     git pull
-  -   else 
-  -     echo "directory empty" 
-  -     git clone https://github.com/gabime/spdlog.git
-  -     cd spdlog
-  -   fi
-  - else
-  -   echo "directory inexistent" 
-  -   git clone https://github.com/gabime/spdlog.git
-  -   cd spdlog
-  - fi
-  - git fetch
-  - git checkout v0.17.0
-  - mkdir -pv build
-  - cd build
-  - ls
-  - cmake -DCMAKE_CXX_FLAGS="${CMAKE_CXX_FLAGS} -fPIC" -DSPDLOG_BUILD_TESTING=OFF ..
-  - make -j$(nproc)
-  - make install
-  - cd ../..
-
-# YAML
-  - apt-get install -y libyaml-cpp-dev
-  
-wolf_build_and_test:
-  stage: build
-  except:
-    - master
+.build_and_test_template: &build_and_test_definition
   script:
     - mkdir -pv build
     - cd build
-    - ls # we can check whether the directory was already full
     - cmake -DCMAKE_BUILD_TYPE=release -DBUILD_DEMOS=ON -DBUILD_TESTS=ON ..
     - make -j$(nproc)
     - ctest -j$(nproc)
@@ -51,3 +9,15 @@ wolf_build_and_test:
     - ../bin/hello_wolf
     - ../bin/hello_wolf_autoconf
     - make install
+
+build_and_test:xenial:
+  image: labrobotica/wolf_deps:16.04
+  except:
+    - master
+  <<: *build_and_test_definition
+
+build_and_test:bionic:
+  image: labrobotica/wolf_deps:18.04
+  except:
+    - master
+  <<: *build_and_test_definition
\ No newline at end of file