remove docker image prune

Author: jacomago

.github/workflows/server.yml

@@ -64,9 +64,6 @@ jobs:
         python -m pip install --upgrade pip
         python -m pip install '.[test]'
         python -m pip install .
-    - name: Clear existing docker image cache
-      shell: bash
-      run: docker image prune -af
     - name: Test with pytest
       run: |
         pytest