try copying synctex betwen directories

services/clsi/entrypoint.sh

@@ -1,6 +1,10 @@
 #!/bin/sh
 
 echo "Changing permissions of /var/run/docker.sock for sibling containers"
+cp /var/clsi/bin/synctex /var/clsi/bin/synctex-mount/synctex
+
 chown root:docker /var/run/docker.sock
+chown app:app /app/compiles
+
 ./bin/install_texlive_gce.sh
 exec runuser -u app "$@"