fix(ci): publish a plain amd64 manifest, so the image runs on Apple Silicon [FTTECH-15471] (#12)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: florentsorel

.github/workflows/docker.yml

@@ -60,6 +60,7 @@ jobs:
         with:
           context: .
           platforms: linux/amd64
+          provenance: false
           push: ${{ github.ref == 'refs/heads/master' && github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}