switch to s6 v3, bump s6 to 3.1.2.1, bump ffmpeg to 2023-01-03-12-55, bump yt-dlp to 2023.01.06, fix multi-arch builds

config/root/etc/s6-overlay/s6-rc.d/redis/run

@@ -0,0 +1,4 @@
+#!/command/with-contenv bash
+
+exec s6-setuidgid redis \
+    /usr/bin/redis-server /etc/redis/redis.conf