Explicitly install latest QEMU on CI for building Docker images (#1645)

.github/workflows/docker.yml

@@ -37,16 +37,9 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0  # for correct image labeling via `git describe --tags`
+      # TODO: Try remove once `moby/buildkit` image upgrades its default QEMU version.
+      - uses: docker/setup-qemu-action@v3
       - uses: docker/setup-buildx-action@v3
-      - name: Configure `max-parallelism = 1` for Docker BuildKit
-        run: echo "[worker.oci]\nmax-parallelism = 1"
-             >> /etc/buildkitd.toml
-        if: ${{ matrix.arch == 'ppc64le' }}
-      - name: Create Docker BuildKit builder
-        run: docker buildx create --use --name container \
-                                  --driver docker-container \
-                                  --config /etc/buildkitd.toml
-        if: ${{ matrix.arch == 'ppc64le' }}
 
       - name: Detect correct Git ref for image build
         id: git