Propose PR when overcloud host images are built

Author: MoteHue

.github/workflows/overcloud-host-image-build.yml

@@ -391,6 +391,22 @@ jobs:
           OS_APPLICATION_CREDENTIAL_SECRET: ${{ secrets.OS_APPLICATION_CREDENTIAL_SECRET }}
         if: always()
 
+      - name: Propose changes via PR if required
+        uses: peter-evans/create-pull-request@v7
+        with:
+          path: ${{ github.workspace }}/src/kayobe-config
+          commit-message: >-
+            Bump overcloud host image(s) to ${{ steps.host_image_tag.outputs.host_image_tag }}
+          author: stackhpc-ci <[email protected]>
+          branch: bump-overcloud-host-images/${{ steps.host_image_tag.outputs.host_image_tag }}
+          delete-branch: true
+          title: >-
+            DNM test PR: Bump overcloud host image(s) to ${{ steps.host_image_tag.outputs.host_image_tag }}
+          body: >
+            This PR was created automatically to update the overcloud host image
+            tag(s) to ${{ steps.host_image_tag.outputs.host_image_tag }}.
+        if: (!inputs.ubuntu-noble || steps.build_ubuntu_noble.outcome == 'success') && (!inputs.rocky9 || steps.build_rocky_9.outcome == 'success')
+
       - name: Send message to Slack via Workflow Builder
         uses: slackapi/[email protected]
         with: