feat: use fedora packaged docker plugin binaries

No need to copy buildx and compose from other images since Fedora has
packaged them since F41. This makes the uCore build more consistent.

Closes: #265

ucore/Containerfile

@@ -22,15 +22,9 @@ ARG COREOS_VERSION="${COREOS_VERSION:-stable}"
 # build with --build-arg NVIDA_TAG="-nvidia" to install nvidia
 ARG NVIDIA_TAG="${NVIDIA_TAG}"
 
-# these versions match docker/moby 27.5.1 which FCOS ships as of 42.20250410
-ARG DOCKER_BUILDX_VERSION=0.20.0
-ARG DOCKER_COMPOSE_VERSION=v2.32.2
-
 COPY system_files/etc /etc
 COPY system_files/usr/lib /usr/lib/
 COPY system_files/usr/sbin /usr/sbin/
-COPY --from=docker.io/docker/buildx-bin:${DOCKER_BUILDX_VERSION} /buildx /usr/libexec/docker/cli-plugins/docker-buildx
-COPY --from=docker.io/docker/compose-bin:${DOCKER_COMPOSE_VERSION} /docker-compose /usr/libexec/docker/cli-plugins/docker-compose
 
 RUN --mount=type=cache,dst=/var/cache/libdnf5 \
     --mount=type=cache,dst=/var/cache/rpm-ostree \

ucore/packages.json

@@ -8,6 +8,8 @@
                 "cockpit-podman",
                 "cockpit-selinux",
                 "cockpit-system",
+                "docker-buildx",
+                "docker-compose",
                 "firewalld",
                 "fwupd-efi",
                 "intel-compute-runtime",