add setup-buildx action to release build#288

ezhang6811 merged 2 commits intoaws-observability:release/v0.8.xaws-observability/aws-otel-js-instrumentation:release/v0.8.xfrom

ezhang6811:buildx-patchezhang6811/aws-otel-js-instrumentation:buildx-patchCopy head branch name to clipboard