mkosi: several cleanups (#38924)

mkosi/mkosi.conf

@@ -111,7 +111,6 @@ Packages=
         llvm
         lsof
         lvm2
-        man
         mdadm
         mtools
         nano

mkosi/mkosi.conf.d/opensuse/mkosi.conf

@@ -59,6 +59,7 @@ Packages=
         libapparmor1
         libcap-progs
         libtss2-tcti-device0
+        man
         multipath-tools
         ncat
         open-iscsi

mkosi/mkosi.images/minimal-base/mkosi.postinst

@@ -3,6 +3,8 @@ set -e
 
 # We don't use mkosi.extra because /usr/sbin could be a symlink and cp doesn't handle that properly until
 # coreutils 9.5 or newer.
+mkdir -p "$BUILDROOT/sbin"
+rm -f "$BUILDROOT/sbin/init"
 cat >"$BUILDROOT/sbin/init" <<EOF
 #!/bin/bash
 echo "Hello from dummy init, beautiful day, innit?"