fix(ci) run at a different time

.github/workflows/unstable.yml

@@ -2,7 +2,7 @@ name: Unstable Build
 
 on:
   schedule:
-    - cron: "0 6 * * *"
+    - cron: "0 5 * * *"
   workflow_dispatch:
 
 jobs:

prosody/Dockerfile

@@ -1,7 +1,7 @@
 ARG JITSI_REPO=jitsi
 ARG BASE_TAG=latest
 
-FROM ${JITSI_REPO}/base:${BASE_TAG} as builder
+FROM ${JITSI_REPO}/base:${BASE_TAG} AS builder
 
 RUN apt-dpkg-wrap apt-get update && \
     apt-dpkg-wrap apt-get install -y \