Update .gitlab-ci.yml file to have a minimal build by default

.gitlab-ci.yml

 variables:
+  sb_cmake_option_ENABLE_ceres:
+    value: '-DENABLE_ceres=False'
+  sb_cmake_option_ENABLE_nanoflann:
+    value: '-DENABLE_nanoflann=False'
+  sb_cmake_option_ENABLE_pcl:
+    value: '-DENABLE_pcl=False'
+  sb_cmake_option_LIDARVIEW_BUILD_SLAM:
+    value: '-DLIDARVIEW_BUILD_SLAM=False'
   CI_VELODYNEPRIVATE_ENABLE:
     value: 'ON'
 include: