build-sys: Add a link to rpm-ostree issue

Just to meke it easier to find.

Signed-off-by: Colin Walters <[email protected]>

Author: cgwalters

contrib/packaging/bootc.spec

@@ -121,7 +121,8 @@ cat >%{?buildroot}/%{system_reinstall_bootc_install_podman_path} <<EOF
 exec dnf -y install podman
 EOF
 chmod +x %{?buildroot}/%{system_reinstall_bootc_install_podman_path}
-# generate doc file list excluding directories
+# generate doc file list excluding directories; workaround for
+# https://github.com/coreos/rpm-ostree/issues/5420
 touch %{?buildroot}/%{_docdir}/bootc/baseimage/base/sysroot/.keepdir
 find %{?buildroot}/%{_docdir} ! -type d -printf '%{_docdir}/%%P\n' > bootcdoclist.txt