Add assembly rc.2 (#5851)

* Add assembly rc.2
Created by job run https://art-jenkins.apps.prod-stable-spoke1-dc-iad2.itup.redhat.com/job/aos-cd-builds/job/build%252Fgen-assembly/325

* Add RHCOS info for missing arches

---------

Co-authored-by: AOS Automation Release Team <noreply@redhat.com>
Co-authored-by: D. Paolella <dpaolell@redhat.com>

releases.yml

@@ -1,4 +1,39 @@
 releases:
+  rc.2:
+    assembly:
+      basis:
+        brew_event: 61818023
+        reference_releases:
+          x86_64: 4.18.0-0.nightly-2024-12-12-133926
+      group:
+        advisories:
+          extras: 138188
+          image: 138189
+          metadata: 138190
+          microshift: 138191
+          prerelease: -1
+          rpm: 138193
+        operator_index_mode: pre-release
+        release_jira: ART-10610
+        upgrades: 4.17.5,4.17.6,4.17.7,4.17.8,4.17.9,4.18.0-ec.3,4.18.0-ec.4,4.18.0-rc.0,4.18.0-rc.1
+      members:
+        images: []
+        rpms: []
+      rhcos:
+        rhel-coreos:
+          images:
+            aarch64: quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:74cd9ef93f61f4725faf79f44b07e156962f31098bc4d7c725c232cbc1a68557
+            ppc64le: quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:a2420f4e629f2eea0d839e88c8e97d0b88a1b2e7ba656426605d73b86c2987cc
+            s390x: quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:d8566d0532e35436e59f8c9b9081287a7b8713c8366148aa7bf7f20b74ef02da
+            x86_64: quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:546ff1548dddfa01495d37c848f4dd7a097aa34fee36f6f4a11ad70071c4a791
+        rhel-coreos-extensions:
+          images:
+            aarch64: quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:f6443ca2ae2350a343eb606694402c66919883d47adc8e75eb54e5c055585ac5
+            ppc64le: quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:21f5eb19da3809febecaf8cb2561a11e0f73de7b52bf621f40d563a5e9eee6b1
+            s390x: quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:512c58613623a5caaaad78250f2b9393deb70489897312200b86e2aa456a87f9
+            x86_64: quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:1617e0a60e57f052e12f7a589823be5a008db90578b16b3d7d4897fce5585ce4
+      type: candidate
+
   rc.1:
     assembly:
       basis: