Fix backstop script for pipeline operations

bin/backstop

@@ -3,8 +3,8 @@
 export $(cat .env | xargs)
 cd tests/backstop
 ./backstop-script-before
-docker run --rm -t -v $(php /usr/local/bin/volume.php) -w $PWD --network=traefik-public backstopjs/backstopjs "$@"
-./backstop-script-after
+docker run --rm -t -v $(php /usr/local/bin/volume.php) -w $PWD --network host backstopjs/backstopjs "$@"
 EC=$?
+./backstop-script-after
 
 exit $EC