build: default to stable

Makefile

@@ -1,5 +1,5 @@
 FORCE_REBUILD ?= 0
-JITSI_RELEASE ?= "unstable"
+JITSI_RELEASE ?= "stable"
 
 ifeq ($(FORCE_REBUILD), 1)
   BUILD_ARGS = "--no-cache"

base/Dockerfile

@@ -1,6 +1,6 @@
 FROM debian:stretch-slim
 
-ARG JITSI_RELEASE=unstable
+ARG JITSI_RELEASE=stable
 
 ADD https://github.com/just-containers/s6-overlay/releases/download/v1.21.2.2/s6-overlay-amd64.tar.gz /tmp/s6-overlay.tar.gz
 ADD https://download.jitsi.org/jitsi-key.gpg.key /tmp/jitsi.key