build: Pass --image-config

Oops.

Containerfile.centos-stream10

@@ -12,8 +12,9 @@ COPY --from=repos /etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial /etc/pki/rpm-gpg
 # rpm-ostree doesn't honor /etc/dnf/vars right now
 RUN for n in $(ls /etc/dnf/vars); do v=$(cat /etc/dnf/vars/$n); sed -ie s,\$${n},$v, c10s.repo; done
 RUN --mount=type=cache,target=/workdir --mount=type=bind,rw=true,src=.,dst=/buildcontext,bind-propagation=shared \
-    cp -a /buildcontext /src && rm -vf /src/*.repo && cp -a c10s.repo /src && ls -al /src  &&\
-    rpm-ostree compose image --cachedir=/workdir --format=ociarchive --initialize /src/${MANIFEST} /buildcontext/out.ociarchive
+    cp -a /buildcontext /src && rm -vf /src/*.repo && cp -a c10s.repo /src && ls -al /src && \
+    rpm-ostree compose image --image-config /buildcontext/centos-bootc-config.json \
+     --cachedir=/workdir --format=ociarchive --initialize /src/${MANIFEST} /buildcontext/out.ociarchive
 
 FROM oci-archive:./out.ociarchive
 # Need to reference builder here to force ordering. But since we have to run