NOISSUE: save last image references so it is easy to reproduce the rebase

[dhellmann]

This change adds a step to the rebase.sh to command to record the
image references used in the rebase. They are saved in the form of
a script that can be used to run the same rebase command again,
which makes it easy to test changes to the rebase script.

/assign @pmtk @fzdarsky

[dhellmann]

When I ran this version of rebase.sh locally, it produced:

commit 6d69c82c29f308990dc6290f5280cfa97875eb44
Author: Doug Hellmann <dhellmann@redhat.com>
Date:   Thu Dec 15 16:52:27 2022 -0500

    update last_rebase.sh

diff --git a/scripts/auto-rebase/last_rebase.sh b/scripts/auto-rebase/last_rebase.sh
new file mode 100755
index 000000000..38049b88a
--- /dev/null
+++ b/scripts/auto-rebase/last_rebase.sh
@@ -0,0 +1,2 @@
+#!/bin/bash -x
+./scripts/auto-rebase/rebase.sh to "registry.ci.openshift.org/ocp/release:4.12.0-0.nightly-2022-12-14-135139" "registry.ci.openshift.org/ocp-arm64/release-arm64:4.12.0-0.nightly-arm64-2022-12-14-185905"

[mangelajo]

/approve

[pmtk]

This is nice, looks like this could be useful when we add job verifying if rebase script was not broken
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dhellmann, mangelajo, pmtk

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD c3f07cb and 2 for PR HEAD 736d32c in total

[openshift-ci]

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