chore: add local build helpers

.gitignore

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+/bin

Makefile

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+build:
+	misc/script/build
+
+.PHONY: build

misc/script/build

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+#!/bin/bash
+
+set -e
+
+DISTS=${DISTS:-linux/386 linux/amd64 windows/amd64 darwin/amd64}
+
+for dist in $DISTS
+do
+    os=`echo $dist | cut -d'/' -f1`
+    arch=`echo $dist | cut -d'/' -f2`
+    
+    env GOOS=$os GOARCH=$arch go build -o bin/werther_${os}_${arch} -ldflags "-w -s -X main.version=$(git describe --tags)" ./cmd/werther
+    
+    if [[ "$os" = "windows" ]]; then
+        zip -r bin/werther_${os}_${arch}.zip bin/werther_${os}_${arch}
+    else
+        tar cvzf bin/werther_${os}_${arch}.tar.gz bin/werther_${os}_${arch}
+    fi
+done
+
+(cd bin && sha256sum *.{tar.gz,zip} > werther_checksums.txt)