Fix oras push flag (tinkerbell#29)

## Description



Fixes: #

## How Has This Been Tested?





## How are existing users impacted? What migration steps/scripts do we need?





## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

Author: mergify[bot]

.github/workflows/ci.yml

@@ -411,7 +411,7 @@ jobs:
         working-directory: out
         run: |
           oras push \
-            --platform linux/${{ matrix.arch }} \
+            --artifact-platform linux/${{ matrix.arch }} \
             ghcr.io/${{ github.repository }}/${{ env.OCI_ARTIFACT_NAME }}:${{ steps.short-sha.outputs.sha }}-${{ matrix.arch }} \
             --annotation org.opencontainers.image.source=https://github.com/${{ github.repository }} \
             --annotation org.opencontainers.image.revision=${{ github.sha }} \