use host network so that streaming works

Dockerfile

@@ -52,7 +52,7 @@ RUN ln -sv librtmp.so.1 /usr/lib/x86_64-linux-gnu/librtmp.so.0 && \
 # TODO: use debian mirrors if possible?
 ADD http://archive.ubuntu.com/ubuntu/pool/main/libg/libgcrypt11/libgcrypt11_1.5.3-2ubuntu4_i386.deb /tmp/libgcrypt11_i386.deb
 ADD http://archive.ubuntu.com/ubuntu/pool/main/libg/libgcrypt11/libgcrypt11_1.5.3-2ubuntu4_amd64.deb /tmp/libgcrypt11_amd64.deb
-ADD http://ftp.de.debian.org/debian/pool/main/j/json-c/libjson-c3_0.12.1-1.1_amd64.deb /tmp/libjson-c3_amd64.deb
+ADD libjson-c3_*_amd64.deb /tmp/libjson-c3_amd64.deb
 RUN cd /tmp && \
     dpkg -i *.deb && \
     rm -f *.deb

docker-compose.yml

@@ -3,7 +3,7 @@ version: '2'
 services:
   steam:
     image: andrey01/steam
-    network_mode: bridge
+    network_mode: host # it's important to use host network so that streaming works
     volumes:
       - /tmp/.X11-unix:/tmp/.X11-unix:ro
       - /etc/localtime:/etc/localtime:ro
@@ -27,7 +27,6 @@ services:
       - /usr/X11R6/lib64:/h11_64:ro
       - /usr/lib:/h12_32:ro
       - /usr/lib64:/h13_64:ro
-    dns: steam # a DNS cache is needed to avoid upstream bug https://github.com/ValveSoftware/steam-for-linux/issues/3401
     devices:
       - /dev/nvidia0
       - /dev/nvidiactl