fix(cron): ensure compare target files are always created

This avoids the issue of failing `comm` calls due to missing files,
which was previously masked as the script did not have errfail set.

cron-jobs/ftpdir-cleanup

@@ -87,6 +87,7 @@ for f in "$FTP_BASE/${PKGPOOL}"/*${PKGEXTS}; do
 done | sort > "${WORKDIR}/pool"
 
 # create a list of packages in our db
+touch "${WORKDIR}/db"
 if [[ -s ${WORKDIR}/pool ]]; then
 	cat "${WORKDIR}"/db-!(*-debug-*) 2>/dev/null | sort -u > "${WORKDIR}/db"
 fi
@@ -97,6 +98,7 @@ for f in "$FTP_BASE/${DEBUGPKGPOOL}"/*${PKGEXTS}; do
 done | sort > "${WORKDIR}/debugpool"
 
 # seperate list for packages in our debug db
+touch "${WORKDIR}/debug-db"
 if [[ -s ${WORKDIR}/debugpool ]]; then
 	cat "${WORKDIR}"/db-*-debug-* 2>/dev/null | sort -u > "${WORKDIR}/debug-db"
 fi