fix: run apk update after enabling Alpine community repo

Agent-Logs-Url: https://github.com/alexbelgium/hassio-addons/sessions/0e7fb54a-7428-4f42-ad0e-8176f2fc3787

Co-authored-by: alexbelgium <44178713+alexbelgium@users.noreply.github.com>

.templates/ha_automatic_packages.sh

@@ -187,6 +187,7 @@ if [ "$PACKMANAGER" = "apk" ] && [ -f /etc/apk/repositories ] && ! grep -q "comm
     ALPINE_VER=$(cat /etc/alpine-release 2>/dev/null | cut -d. -f1,2)
     if [ -n "$ALPINE_VER" ]; then
         echo "https://dl-cdn.alpinelinux.org/alpine/v${ALPINE_VER}/community" >> /etc/apk/repositories
+        apk update > /dev/null
     fi
 fi