Move to daily archlinux build and check if there is PKGBUILD before

building

run.sh

@@ -2,6 +2,11 @@
 
 set -xeuo pipefail
 
+if [[ ! -f /w/PKGBUILD ]]; then
+		echo "Missing PKGBUILD in /w"
+		exit 1
+fi
+
 #  /etc/hosts is managed by podman. Copying or editing with `sed -i` does not seem to work. Only appendig works
 #  podman sets up 169.254.1.2 to be the ip of the host
 sudo sh -c 'echo "169.254.1.2  archmirror.i.balki.me" >> /etc/hosts'