Move docker prune cmd outside of api common install shell script

Signed-off-by: danfengliu <danfengl@vmware.com>

.github/workflows/CI.yml

@@ -148,6 +148,7 @@ jobs:
           cd src/github.com/goharbor/harbor
           env
           df -h
+          docker system prune -a -f
           bash ./tests/showtime.sh ./tests/ci/api_common_install.sh $IP DB
       - name: script
         run: |

tests/ci/api_common_install.sh

@@ -4,7 +4,6 @@ set -x
 set +e
 sudo rm -fr /data/*
 sudo mkdir -p /data
-docker system prune -a -f
 DIR="$(cd "$(dirname "$0")" && pwd)"
 
 set -e