Add build script

.gitignore

@@ -15,3 +15,4 @@
 /dist/
 
 main
+tmp

build.bash

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+mkdir -p tmp
+
+systems=( windows linux darwin  )
+archs=( amd64 arm64 )
+
+for system in "${systems[@]}"; do
+    for arch in "${archs[@]}"; do
+        if [ "$system" == "windows" ] && [ "$arch" == "arm64" ]; then
+            echo "windows/arm64 not yet supported by tinygo"
+            continue
+        fi
+        echo "building $system/$arch"
+        # GOOS=${system} GOARCH=${arch} tinygo build -o tmp/"${system}_${arch}" cmd/epoch/main.go
+        docker run --rm -w /src -v "$(pwd)":/src -e GOOS="${system}" -e GOARCH="${arch}" tinygo/tinygo tinygo build -o "tmp/${system}_${arch}" cmd/epoch/main.go
+    done
+done