docker: Copy optional subscriber_db file

Author: FabianEckermann

docker/open5gs/Dockerfile

@@ -75,6 +75,8 @@ COPY open5gs-5gc.yml open5gs-5gc.yml.in
 COPY open5gs_entrypoint.sh .
 COPY add_users.py .
 COPY setup_tun.py .
+# This tries to copy "subscriber_db.csv" but will not fail if the file doesn't exist
+COPY subscriber_db.cs[v] .
 
 ENV PATH="${PATH}:/open5gs/build/tests/app/"