mkosi: add libz1 to packages list on opensuse

/usr/lib/systemd/systemd: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory

Author: bluca

mkosi.images/base/mkosi.conf.d/10-opensuse.conf

@@ -34,6 +34,7 @@ Packages=
         libtss2-rc0
         libtss2-tcti-device0
         libxkbcommon0
+        libz1
         libzstd1
         pam
         rsync