Remove ARMv7 container build

This is just hanging when building on GH Actions and we don't need it for FF Cloud

Author: hardillb

.github/workflows/release-publish.yml

@@ -48,10 +48,10 @@ jobs:
           file: docker/Dockerfile
           tags: ${{ steps.meta.outputs.tags }}
           push: true
-          platforms: linux/amd64, linux/arm64, linux/arm/v7
+          platforms: linux/amd64,linux/arm64
       - name: Publish README.md to Docker Hub
         uses: peter-evans/dockerhub-description@v4
         with:
           repository: flowfuse/mqtt-schema-agent
           password: ${{ secrets.DOCKER_HUB_PASSWORD }}
-          readme-filepath: ./docker/README.md
+          readme-filepath: ./docker/README.md