fix: stabilize im server startup and p2p topic scans

docker/tinode/Dockerfile.build

@@ -27,7 +27,7 @@ LABEL name="ImServer"
 ENV WAIT_FOR=
 ENV RESET_DB=false
 ENV UPGRADE_DB=false
-ENV NO_DB_INIT=false
+ENV NO_DB_INIT=true
 # Empty by default: do not load Tinode's canned demo users into a real deployment.
 # Override explicitly if sample data is ever wanted.
 ENV SAMPLE_DATA=
@@ -51,6 +51,7 @@ ENV FCM_PUSH_ENABLED=false
 ENV FCM_INCLUDE_ANDROID_NOTIFICATION=true
 ENV TNPG_PUSH_ENABLED=false
 ENV WEBRTC_ENABLED=false
+ENV ICE_SERVERS_FILE=/opt/tinode/ice-servers.json
 ENV SERVER_STATUS_PATH=''
 ENV ACC_GC_ENABLED=false
 ENV PLUGIN_PYTHON_CHAT_BOT_ENABLED=false
@@ -68,6 +69,7 @@ WORKDIR /opt/tinode
 
 COPY docker/tinode/config.template .
 COPY docker/tinode/entrypoint.sh .
+COPY docker/tinode/ice-servers.json .
 COPY tinode-db/credentials.sh .
 COPY server/templ ./templ
 COPY --from=build /out/tinode .