cross compile quic-go for all platforms / architectures

.github/workflows/cross-compile.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e
+
+GOVERSION=$(go version | cut -d " " -f 3 | cut -b 3-6)
+
+for dist in $(go tool dist list); do
+	goos=$(echo $dist | cut -d "/" -f1)
+	goarch=$(echo $dist | cut -d "/" -f2)
+	if [[ "$goos" == "android" ]]; then continue; fi 		# cross-compiling for android is a pain...
+	if [[ "$goos" == "darwin" && $goarch == "arm64" ]]; then continue; fi # ... darwin/arm64 neither
+	if [[ $GOVERSION == "1.14" && $goos == "darwin" && $goarch == "arm" ]]; then continue; fi # Go 1.14 lacks syscall.IPV6_RECVTCLASS
+
+	echo "$dist"
+	GOOS=$goos GOARCH=$goarch go build -o main example/main.go
+	rm main
+done