docker-entrypoint: ensure output dir

docker-entrypoint.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 echo "/patched-lib" > /etc/ld.so.conf.d/000-patched-lib.conf && \
+mkdir -p "/patched-lib" && \
 PATCH_OUTPUT_DIR=/patched-lib /usr/local/bin/patch.sh && \
 cd /patched-lib && \
 for f in * ; do