Fix cat redirection

Just a small fix, adding a missing redirection so that
'01-bootc-nohostonly.conf' is not created empty.
Since dracut's default is 'hostonly=no' this fix has
no impact on the initramfs contents.

Signed-off-by: German Maglione <gmaglione@redhat.com>

tier-0/initramfs.yaml

@@ -3,7 +3,7 @@ postprocess:
   - |
     #!/usr/bin/env bash
     mkdir -p /usr/lib/dracut/dracut.conf.d
-    cat > /usr/lib/dracut/dracut.conf.d/01-bootc-nohostonly.conf
+    cat > /usr/lib/dracut/dracut.conf.d/01-bootc-nohostonly.conf << 'EOF'
     # We want a generic image; hostonly makes no sense as part of a server side build
     hostonly=no
     EOF