(pip) Use waves docker image

.gitlab-ci.yml

 default:
-    image: pdechamps/blaster:v1
+    image: rboman/waves-py3:2020.3
     before_script:
         - source /opt/intel/mkl/bin/mklvars.sh intel64
         - source /opt/intel/tbb/bin/tbbvars.sh intel64