Update free-disk-space.sh

Author: ChrisDenton

src/ci/scripts/free-disk-space.sh

@@ -11,8 +11,9 @@ if [[ "$1" == "start" ]]; then
     else
         $script_dir/free-disk-space-linux.sh &> $log &
     fi
+    FREE_DISK_SPACE_PID=$! >> $GITHUB_ENV
 elif [[ "$1" == "report" ]]; then
-    wait
+    wait $FREE_DISK_SPACE_PID
     exit_code=$?
     cat $log
     exit $exit_code