Fix lsb_release parser

Author: svpcom

Makefile

@@ -1,7 +1,7 @@
 SHELL = /bin/bash
 ARCH ?= $(shell uname -m)
 PYTHON ?= /usr/bin/python3
-OS_CODENAME ?= $(shell grep VERSION_CODENAME= /etc/os-release | cut -f2 -d=)
+OS_CODENAME ?= $(shell lsb_release -cs)
 
 ifneq ("$(wildcard .git)","")
     RELEASE ?= $(or $(shell git rev-parse --abbrev-ref HEAD | grep -v '^stable$$'),\

docker/Dockerfile

@@ -6,7 +6,7 @@ ENV QEMU_CPU=$QEMU_CPU
 
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive \
-    apt-get install -y build-essential git wget \
+    apt-get install -y lsb-release build-essential git wget \
     virtualenv fakeroot debhelper \
     libpcap-dev libsodium-dev libevent-dev \
     python3-twisted python3-pyroute2 \