OSDOCS-15170: 4.12.78 z-stream RN

Author: tmalove

release_notes/ocp-4-12-release-notes.adoc

@@ -5204,3 +5204,28 @@ With this release, you can use the installation program to create an external cl
 ==== Updating
 
 To update an existing {product-title} 4.12 cluster to this latest release, see xref:../updating/updating-cluster-cli.adoc#updating-cluster-cli[Updating a cluster using the CLI].
+
+// 4.12.78
+[id="ocp-4-12-78_{context}"]
+=== RHSA-2025:10270 - {product-title} 4.12.78 bug fix and security update
+
+Issued: 10 July 2025
+
+{product-title} release 4.12.78 is now available. The list of bug fixes that are included in the update is documented in the link:https://access.redhat.com/errata/RHSA-2025:10270[RHSA-2025:10270] advisory. The RPM packages that are included in the update are provided by the link:https://access.redhat.com/errata/RHSA-2025:10271[RHSA-2025:10271] advisory.
+
+You can view the container images in this release by running the following command:
+
+[source,terminal]
+----
+$ oc adm release info 4.12.78 --pullspecs
+----
+
+[id="ocp-4-12-78-bug-fixes_{context}"]
+==== Bug fixes
+
+* Previously, injecting proxy environment variables caused build failures due to external binary compatibility issues. As a consequence, the build process was disrupted. With this release, the check for a null proxy environment variable is added to the process to prevent the build failures.  (link:https://issues.redhat.com/browse/OCPBUGS-57171[OCPBUGS-57171])
+
+[id="ocp-4-12-78-updating_{context}"]
+==== Updating
+
+To update an existing {product-title} 4.12 cluster to this latest release, see xref:../updating/updating-cluster-cli.adoc#updating-cluster-cli[Updating a cluster using the CLI].