drop armv6 in attempt to debug build process

.github/workflows/docker-publish.yml

@@ -100,7 +100,7 @@ jobs:
             REVISION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.revision'] }}
           # https://github.com/docker/setup-qemu-action#about
           # platforms: linux/amd64,linux/arm64,linux/riscv64,linux/ppc64le,linux/s390x,linux/386,linux/mips64le,linux/mips64,linux/arm/v7,linux/arm/v6
-          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max