ci/prow: temporarily stop composing with new rpm-ostree

Until a new rpm-ostree is out with the new
`rpm-ostree-0-integration-opt-usrlocal.conf` file and part of cosa.

This duplicates the CoreOS CI test anyway.

Note we do still put rpm-ostree in the target system we compose and run
kola tests on.

See #4763 (comment)

ci/prow/Dockerfile

@@ -12,7 +12,9 @@ USER root
 # Copy binaries from the build
 COPY --from=builder /cosa /cosa
 # Merge them to the real root since we're used at compose time
-RUN rsync -rlv /cosa/component-install/ /
+# XXX: disabled for now
+# https://github.com/coreos/rpm-ostree/pull/4763#issuecomment-1883686187
+# RUN rsync -rlv /cosa/component-install/ /
 # Merge installed tests
 RUN rsync -rlv /cosa/component-tests/ /
 # Grab all of our ci scripts