Update .github/workflows/build-docker-monorepo.yml

Co-authored-by: Brad Jorsch <[email protected]>

Author: kraftbj

.github/workflows/build-docker-monorepo.yml

@@ -87,7 +87,7 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          platform: linux/arm64,linux/amd64
+          platforms: linux/arm64,linux/amd64
           build-args: |
             PHP_VERSION=${{ steps.buildargs.outputs.php-version }}
             COMPOSER_VERSION=${{ steps.buildargs.outputs.composer-version }}