Don't remove directory if exists, remove files in it instead

This resolves an edge case where the original WORKDIR is at `/workspace`, and then we proceed to download a directory from Nucleus to `/workspace`. This will cause the directory to be delete and recreated, making the current directory a deleted directory. If the user is not aware of this behavior, they may assume they are in the true `/workspace` directory.

scripts/docker/run.sh

@@ -64,7 +64,8 @@ fi
 if [ -n "$DOWNLOAD_SRC" ] || [ -n "$DOWNLOAD_DEST" ]; then
   if [ -e "$DOWNLOAD_DEST" ]; then
     echo "File exists at '$DOWNLOAD_DEST', deleting..."
-    rm -rf "$DOWNLOAD_DEST"
+    rm -rf "$DOWNLOAD_DEST/*"
+    rm -rf "$DOWNLOAD_DEST/.*"
   fi
   echo "Copying files from '$DOWNLOAD_SRC' to '$DOWNLOAD_DEST'..."
   ( cd /omnicli && ./omnicli copy "$DOWNLOAD_SRC" "$DOWNLOAD_DEST" )