fix: simplify TRUSTEDPROXIES format and add IPv6 loopback

Author: webees

Dockerfile

@@ -15,7 +15,8 @@ ENV WORKDIR=/app \
     OVERMIND_PROCFILE=/Procfile \
     OVERMIND_CAN_DIE=crontab \
     # Gotify settings
-    GOTIFY_SERVER_PORT=8080
+    GOTIFY_SERVER_PORT=8080 \
+    GOTIFY_SERVER_TRUSTEDPROXIES=[127.0.0.1,::1]
 
 WORKDIR $WORKDIR