create builds using go and docker

.gitignore

@@ -1 +1,2 @@
-.vscode
+.vscode/
+out/

build

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+#!/bin/sh
+# Create all the different builds for listen
+
+# verify we are at root of repository
+if ! [ -d .git ]; then
+  echo build: this script must be run at the root of the repo
+  exit 1
+fi
+
+build_go() {
+  go build -o out/$(go env GOOS)/listen .
+}
+
+build_docker() {
+  if [ $DOCKER_IMAGE ]; then
+    image=$DOCKER_IMAGE
+  else
+    image=1-alpine
+  fi
+
+  if echo $i | grep -q server; then
+    os=windows
+    exe=C:/build/listen/listen.exe
+  else
+    os=linux
+    exe=/usr/src/listen/listen
+  fi
+
+  echo building with $os image golang:$image
+  mkdir -p out/docker
+  docker build -t listen-build --build-arg IMAGE=$image -f docker/build.$os.Dockerfile .
+  docker create --name listen-build-tmp listen-build
+  docker cp listen-build-tmp:$exe out/docker
+  docker rm listen-build-tmp
+}
+
+mkdir -p out
+# if an arg is specified, force building with the specified method
+[ $1 ] && build_$1
+
+# prefer building with local go install if it exists on path
+if which go &> /dev/null; then
+  build_go
+# otherwise, try building with docker
+elif which docker &> /dev/null; then
+  build_docker
+fi

docker/build.linux.Dockerfile

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+# This Dockerfile is meant for building listen for Linux ONLY
+# listen is currently not intended to run in a Docker container
+
+ARG IMAGE
+
+FROM golang:${IMAGE} AS build
+
+WORKDIR /usr/src/listen
+COPY . .
+
+RUN apk upgrade --no-cache
+RUN go build .
+
+CMD ["tail", "-f", "/dev/null"]

docker/build.windows.Dockerfile

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+# This Dockerfile is meant for building listen for Windows ONLY
+# listen is currently not intended to run in a Docker container
+
+ARG IMAGE
+
+FROM golang:${IMAGE} AS build
+
+WORKDIR C:/build/listen
+COPY . .
+
+RUN go build .
+
+CMD ["ping.exe", "-t", "localhost"]