replace multi-platform-runner image with buildah-task

Author: tisutisu

task/build-vm-image/0.1/build-vm-image.yaml

@@ -113,7 +113,7 @@ spec:
         echo "declare TAGGED_AS=${TAGGED_AS}" >> /var/workdir/vars
 
     - name: build
-      image: quay.io/redhat-appstudio/multi-platform-runner:01c7670e81d5120347cf0ad13372742489985e5f@sha256:246adeaaba600e207131d63a7f706cffdcdc37d8f600c56187123ec62823ff44
+      image: quay.io/konflux-ci/buildah-task:latest@sha256:b2d6c32d1e05e91920cd4475b2761d58bb7ee11ad5dff3ecb59831c7572b4d0c
       computeResources:
         limits:
           memory: 512Mi