Creates prosody conf.avail if missing.

debian/jitsi-meet-prosody.postinst

@@ -42,6 +42,7 @@ case "$1" in
         # check for config in conf.avail or check whether it wasn't already configured in main config
         if [ ! -f $PROSODY_HOST_CONFIG ] && ! grep -q "VirtualHost \"$JVB_HOSTNAME\"" $PROSODY_CONFIG_OLD; then
             PROSODY_CONFIG_PRESENT="false"
+            mkdir -p /etc/prosody/conf.avail/
             cp /usr/share/doc/jitsi-meet-prosody/prosody.cfg.lua-jvb.example $PROSODY_HOST_CONFIG
             sed -i "s/jitmeet.example.com/$JVB_HOSTNAME/g" $PROSODY_HOST_CONFIG
             sed -i "s/jitmeetSecret/$JVB_SECRET/g" $PROSODY_HOST_CONFIG