update drone.yml

drone.yml

     - mkdir -p dist/etc/nginx/snippets
     - cp -p config/nginx-datasrc-location.conf dist/etc/nginx/snippets/nginx-datasrc-location.conf
     - mv dist $RELEASE
-    - ls -l $RELEASE ; md5sum $RELEASE/*
+    - ls -la $RELEASE
+    - find $RELEASE -type f -exec md5sum '{}' \;
     - rm -rf release ; mkdir release
     - zip -rp   release/$RELEASE.zip    $RELEASE
     - tar -czvf release/$RELEASE.tar.gz $RELEASE
     - tar -cJvf release/$RELEASE.tar.xz $RELEASE
-    - ls -l release ; md5sum release/*
+    - ls -la release
+    - find release -type f -exec md5sum '{}' \;
     - echo "Build finished."
 
 - name: release