Slightly simplify the build

docker/alpine.Dockerfile

@@ -15,17 +15,18 @@ RUN mkdir -p "/out/rootfs"
 COPY packages/alpine-minirootfs-${ALPINE_VER}-${ALPINE_ARCH}.tar.gz ./alpine.tar.gz
 COPY packages/${CRIO_VERSION}.tar.gz ./crio.tar.gz
 COPY out/board.itb ./
-COPY out/rootfs ./rootfs
+COPY out/rootfs.tar.gz ./rootfs.tar.gz
 COPY out/${DEVICE_TREE_TARGET}.dtb ./
 COPY out/Image.gz ./
 
-RUN tar -xf alpine.tar.gz -C "/out/rootfs"
+RUN tar zxf rootfs.tar.gz -C "/out"
+RUN tar zxf alpine.tar.gz -C "/out/rootfs"
 
 RUN mkdir -p /out/rootfs/usr/local/bin/
 COPY packages/kubernetes/kubelet-${KUBE_VERSION} /out/rootfs/usr/local/bin/kubelet
 COPY packages/kubernetes/kubeadm-${KUBE_VERSION} /out/rootfs/usr/local/bin/kubeadm
 COPY packages/kubernetes/kubectl-${KUBE_VERSION} /out/rootfs/usr/local/bin/kubectl
-COPY clitools/bin/ctl-linux-${ALPINE_ARCH}-${TAG} /out/rootfs/usr/local/bin/ctl
+# COPY clitools/bin/ctl-linux-${ALPINE_ARCH}-${TAG} /out/rootfs/usr/local/bin/ctl
 RUN chmod +x /out/rootfs/usr/local/bin/*
 
 COPY alpine/rootfs-extra ./rootfs-extra

docker/build-base.Dockerfile

@@ -21,6 +21,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     flex \
     git \
     gettext-base \
+	jq \
     kmod \
     libelf-dev \
     libssl-dev \

docker/kernel-build.Dockerfile

@@ -47,6 +47,7 @@ RUN depmod -b /out/rootfs $(ls /out/rootfs/lib/modules/)
 
 RUN find /out/kernel -name "${DEVICE_TREE_TARGET}.dtb" -exec cp {} /out/ \;
 RUN test -f "/out/${DEVICE_TREE_TARGET}.dtb"
+RUN cd /out && tar zcf rootfs.tar.gz rootfs
 
 FROM scratch
 ARG DEVICE_TREE_TARGET
@@ -57,4 +58,4 @@ COPY --from=build \
 	/out/kernel/Image.gz \
 	/out/${DEVICE_TREE_TARGET}.dtb \
 	./
-COPY --from=build /out/rootfs/ ./rootfs
+COPY --from=build /out/rootfs.tar.gz ./rootfs.tar.gz