fix: configure Docker buildx for multi-platform builds

Added Docker buildx setup with docker-container driver to support
multi-platform Docker image builds in the release job.

Changes:
- Set up Docker buildx with moby/buildkit driver
- Login to GitHub Container Registry before GoReleaser

This fixes the error:
"Multi-platform build is not supported for the docker driver"

.github/workflows/go-release-cgo.yaml

@@ -248,6 +248,18 @@ jobs:
               with:
                   go-version: ${{ inputs.go-version }}
 
+            - name: Set up Docker Buildx
+              uses: docker/setup-buildx-action@v3
+              with:
+                  driver-opts: image=moby/buildkit:latest
+
+            - name: Login to GitHub Container Registry
+              uses: docker/login-action@v3
+              with:
+                  registry: ghcr.io
+                  username: ${{ github.actor }}
+                  password: ${{ secrets.GITHUB_TOKEN }}
+
             - name: Download all artifacts
               uses: actions/download-artifact@v4
               with: