build-sys: Clean more directories

Signed-off-by: Colin Walters <walters@verbum.org>

Containerfile

@@ -36,7 +36,8 @@ rm -rf /etc/systemd/user/*
 systemctl --user --global preset-all
 
 dnf clean all
-rm -vrf /var/log/*
+# Lots of cleaning
+rm -vrf /var/log /var/cache /var/lib/dnf
 bootc container lint
 EORUN