Neglected to install buildx inside container

Dockerfile

@@ -1,6 +1,9 @@
 # Use the official Ruby 3.2.0 Alpine image as the base image
 FROM ruby:3.2.0-alpine
 
+# Install  docker/buildx-bin
+COPY --from=docker/buildx-bin /buildx /usr/libexec/docker/cli-plugins/docker-buildx
+
 # Set the working directory to /mrsk
 WORKDIR /mrsk