Widen beatmap volume permissions

To allow for cross-container usage

Dockerfile

@@ -9,7 +9,8 @@ ENV ASPNETCORE_ENVIRONMENT=Production
 ENV BEATMAP_DIRECTORY=/beatmaps
 
 VOLUME ${BEATMAP_DIRECTORY}
-RUN mkdir ${BEATMAP_DIRECTORY} && chown -R app:app ${BEATMAP_DIRECTORY}
+# chmod 777 so that this volume can be read/written by other containers that might use different uids
+RUN mkdir ${BEATMAP_DIRECTORY} && chmod -R 777 ${BEATMAP_DIRECTORY}
 
 USER app