Update .gitlab-ci.yml file, changed docker source

.gitlab-ci.yml

 default:
-    image: rboman/waves-py3:2020.3
+    image: pdechamps/blaster:v1
     before_script:
         - source /opt/intel/mkl/bin/mklvars.sh intel64
         - source /opt/intel/tbb/bin/tbbvars.sh intel64
@@ -23,9 +23,6 @@ stages:
 build:
     <<: *global_tag_def
     stage: build
-    before_script:
-        - apt-get install -y python3-pip
-        - python3 -m pip install scipy==1.11.3 --user
     script:
         - git submodule init
         - git submodule update