Add go-compile script to linuxkit/alpine

This means Go code can use the same base image, which now includes Go tooling.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

tools/alpine/go-compile.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+
+set -e
+
+usage() {
+	echo "Usage: dir"
+	exit 1
+}
+
+[ $# = 0 ] && usage
+
+dir="$1"
+
+cd "$dir"
+
+# lint before building
+>&2 echo "gofmt..."
+test -z $(gofmt -s -l .| grep -v .pb. | grep -v vendor/ | tee /dev/stderr)
+
+>&2 echo "govet..."
+test -z $(GOOS=linux go tool vet -printf=false . 2>&1 | grep -v vendor/ | tee /dev/stderr)
+
+>&2 echo "golint..."
+test -z $(find . -type f -name "*.go" -not -path "*/vendor/*" -not -name "*.pb.*" -exec golint {} \; | tee /dev/stderr)
+
+>&2 echo "ineffassign..."
+test -z $(find . -type f -name "*.go" -not -path "*/vendor/*" -not -name "*.pb.*" -exec ineffassign {} \; | tee /dev/stderr)
+
+>&2 echo "go test..."
+go test
+
+>&2 echo "go build..."
+
+export CGO_ENABLED=0
+
+if [ "$GOOS" = "darwin" -o "$GOOS" = "windows" ]
+then
+	if [ -z "$ldflags" ]
+	then
+		go install
+	else
+		go install -ldflags "${ldflags}"
+	fi
+else
+	go install -buildmode pie -ldflags "-s -w ${ldflags} -extldflags \"-fno-PIC -static\""
+fi