basic-fixes: Tweak /usr/lib/tmpfiles.d/provision.conf

This ensures that systemd's creation of `/root` works instead
of falling back to what we have in
`/usr/lib/tmpfiles.d/rpm-ostree-0-integration.conf` for
`d /var/roothome 0700 root root -` which in turn ensures
that both the credential values as well as bootc's injection
of a tmpfiles.d snippet for root SSH key works.

containers/bootc#358

tier-0/basic-fixes.yaml

@@ -17,3 +17,10 @@ postprocess:
     if test '!' -f /usr/lib/systemd/system/local-fs.target.wants/tmp.mount; then
       ln -sf ../tmp.mount /usr/lib/systemd/system/local-fs.target.wants
     fi
+
+    # See https://github.com/containers/bootc/issues/358
+    # basically systemd-tmpfiles doesn't follow symlinks; ordinarily our
+    # tmpfiles.d unit for `/var/roothome` is fine, but this actually doesn't
+    # work if we want to use tmpfiles.d to write to `/root/.ssh` because
+    # tmpfiles gives up on that before getting to `/var/roothome`.
+    sed -ie s,/root,/var/roothome, /usr/lib/tmpfiles.d/provision.conf