added ENV forcing only encrypted connections

docker/Dockerfile

@@ -11,6 +11,7 @@ RUN \
 COPY rootfs /
 
 ENV RELAY relay.example.com
+ENV ENCRYPTED_ONLY 0
 
 EXPOSE 21115 21116 21116/udp 21117 21118 21119
 

docker/rootfs/etc/s6-overlay/s6-rc.d/hbbs/run

@@ -1,3 +1,5 @@
-#!/command/execlineb -P
-posix-cd /data
-/usr/bin/hbbs -r $RELAY
+#!/command/with-contenv sh
+cd /data
+PARAMS=
+[ "${ENCRYPTED_ONLY}" = "1" ] && PARAMS="-k _"
+/usr/bin/hbbs -r $RELAY $PARAMS