re-add cache removal

Author: rasswanth-s

tox.ini

@@ -727,6 +727,11 @@ commands =
         deploy -b; \
         do ((--r))||exit;echo "retrying" && sleep 20;done)'
 
+    # free up build cache after build of images
+    bash -c 'if [[ "$GITHUB_CI" != "false" ]]; then \
+        docker image prune --all --force; \
+        docker builder prune --all --force; \
+    fi'
 
     sleep 30