riscv64: Replace 9p rootfs with virtio-blk

The new dev-riscv image will contain a `rootfs.img` to be used as
`virtio-blk`. Effectively resolve the problems encountered while running
unit-tests of `linux-loader` and `vm-memory`.

Signed-off-by: Ruoqing He <[email protected]>

.github/workflows/docker-publish.yml

@@ -117,6 +117,27 @@ jobs:
           echo "VERSION=${NEXT_VERSION}" >> $GITHUB_ENV
           echo "Next version to be published is: ${NEXT_VERSION}"
 
+      - name: Build RISC-V rootfs
+        id: build-riscv-rootfs
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: Dockerfile.riscv64_rootfs
+          push: false
+          load: true
+          platforms: linux/amd64
+          tags: rootfs
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Convert rootfs to raw image
+        run: |
+          mkdir -p ./extracted
+          docker run --privileged --rm --volume ./riscv64/convert.sh:/convert.sh \
+            --volume ./extracted:/to_extract --entrypoint /convert.sh rootfs
+          docker buildx prune --all --force
+          docker image rm rootfs
+
       - name: Build and push Docker image for RISC-V
         id: build-and-push-riscv
         uses: docker/build-push-action@v6

riscv64/convert.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+set -ex
+
+apt-get update
+
+DEBIAN_FRONTEND="noninteractive" apt-get install --no-install-recommends -y \
+    qemu-utils
+
+TMP_MOUNT_DIR=tmp_mount_dir
+ROOTFS_DIR=/opt/rootfs
+EXTRACT_DIR=/to_extract
+
+# Move rootfs into image with raw format
+qemu-img create $EXTRACT_DIR/rootfs.img 5G && mkfs.ext4 $EXTRACT_DIR/rootfs.img
+mkdir $TMP_MOUNT_DIR
+# This operation need `privileged` docker container
+mount -o loop $EXTRACT_DIR/rootfs.img $TMP_MOUNT_DIR
+mv $ROOTFS_DIR/* $TMP_MOUNT_DIR
+umount $TMP_MOUNT_DIR
+rmdir $TMP_MOUNT_DIR
+
+mv /root/.ssh $EXTRACT_DIR
+# Enable docker builx to transfer into container
+chmod 777 $EXTRACT_DIR/.ssh