reuse env_image script in export test

Author: archmoj

.circleci/config.yml

@@ -108,14 +108,8 @@ jobs:
       - attach_workspace:
           at: ~/
       - run:
-          name: which pip3 version
-          command: which pip3 && pip3 --version
-      - run:
-          name: install kaleido v0.2.1
-          command: python3 -m pip install kaleido==0.2.1
-      - run:
-          name: install plotly.io v5.0.0
-          command: python3 -m pip install plotly==5.0.0
+          name: install kaleido, plotly.io and required fonts
+          command: .circleci/env_image.sh
       - run:
           name: install poppler-utils to have pdftops for exporting eps
           command: sudo apt-get install poppler-utils