Update test_build.yml

Author: briantoby

.github/workflows/test_build.yml

@@ -28,8 +28,8 @@ jobs:
             dirname="$(basename "${path}")"
             dest="../${dirname}"
             mkdir -v ${dest}
-            [ -d "${path}/data" ] || cp -rv "${path}/data" ${dest}/
-            [ -d "${path}/imgs" ] || cp -rv "${path}/imgs" ${dest}/
+            [ ! -d "${path}/data" ] || cp -rv "${path}/data" ${dest}/
+            [ ! -d "${path}/imgs" ] || cp -rv "${path}/imgs" ${dest}/
             cp -v tutorial.css ${dest}
             for fil in $dirname/*.md; do
               echo $fil