fix: add docker buildx setup for dockers_v2 attestation support

dockers_v2 adds --attest=type=sbom by default, which requires the
docker-container buildx driver. Add docker/setup-buildx-action to
the release workflow to replace the default docker driver.

Author: mchmarny

.github/actions/go-build-release/action.yml

@@ -36,6 +36,9 @@ runs:
         install_syft: 'true'
         install_goreleaser: 'true'
 
+    - name: Setup Docker Buildx
+      uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2  # v3.10.0
+
     - name: Authenticate to registry
       uses: ./.github/actions/ghcr-login
       with: