ci: add bootc install to-disk test in c9s-bootc-e2e

.github/workflows/ci.yml

@@ -39,7 +39,23 @@ jobs:
           tags: localhost/bootupd:latest
       - name: Copy to podman
         run: sudo skopeo copy docker-daemon:localhost/bootupd:latest containers-storage:localhost/bootupd:latest
-      - name: bootc install
+      - name: bootc install to disk
+        run: |
+          set -xeuo pipefail
+          sudo truncate -s 10G myimage.raw
+          sudo podman run --rm -ti --privileged -v .:/target --pid=host --security-opt label=disable \
+            -v /var/lib/containers:/var/lib/containers \
+            -v /dev:/dev \
+            localhost/bootupd:latest bootc install to-disk --skip-fetch-check \
+            --disable-selinux --generic-image --via-loopback /target/myimage.raw
+          # Verify we installed grub.cfg and shim on the disk
+          sudo losetup -P -f myimage.raw
+          device=$(losetup --list --noheadings --output NAME,BACK-FILE | grep myimage.raw | awk '{print $1}')
+          sudo mount "${device}p2" /mnt/
+          sudo ls /mnt/EFI/centos/{grub.cfg,shimx64.efi}
+          sudo losetup -D "${device}"
+          sudo rm -f myimage.raw
+      - name: bootc install to filesystem
         run: |
           set -xeuo pipefail
           sudo podman run --rm -ti --privileged -v /:/target --pid=host --security-opt label=disable \