auto update new-style config.php on container boot

src/app/startup.sh

@@ -68,8 +68,11 @@ fi
 if [ ! -s $DST_DIR/config.php ]; then
 	cp /config.docker.php $DST_DIR/config.php
 else
-	egrep -q 'SELF_URL_PATH.*getenv' $DST_DIR/config.php || \
+	if egrep -q 'SELF_URL_PATH.*getenv' $DST_DIR/config.php; then
 		echo -e "\nWARNING: you're using old-style config.php, overrides via .env will not work.\n" >/dev/stderr
+	else
+		cp /config.docker.php $DST_DIR/config.php
+	fi
 fi
 
 # this was previously generated