Add Dockerfiles for compiling the guestbook and building a minimal image

examples/guestbook-go/src/Dockerfile

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+FROM google/golang:latest
+
+RUN go get github.com/Gurpartap/guestbook-example && \
+    cp /gopath/src/github.com/Gurpartap/guestbook-example/busybox-image/Dockerfile /gopath
+
+CMD docker build --rm --force-rm -t gurpartap/guestbook-example /gopath

examples/guestbook-go/src/busybox-image/Dockerfile

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+FROM busybox:ubuntu-14.04
+
+ADD ./bin/guestbook-example /app/guestbook-example
+ADD ./src/github.com/Gurpartap/guestbook-example/public/index.html /app/public/index.html
+ADD ./src/github.com/Gurpartap/guestbook-example/public/script.js /app/public/script.js
+ADD ./src/github.com/Gurpartap/guestbook-example/public/style.css /app/public/style.css
+
+WORKDIR /app
+CMD ["./guestbook-example"]
+EXPOSE 3000

examples/guestbook-go/src/busybox-image/script/build.sh

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+#!/bin/sh
+# Usage: ./build.sh
+
+docker build --rm --force-rm -t gurpartap/guestbook-example-build .
+docker run --rm -v /var/run/docker.sock:/var/run/docker.sock \
+                -v $(which docker):/usr/local/bin/docker \
+                -ti --name guestbook-example-build gurpartap/guestbook-example-build

examples/guestbook-go/src/busybox-image/script/clean.sh

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+#!/bin/sh
+# Usage: ./clean.sh
+
+docker rm -f guestbook-example-build 2> /dev/null
+docker rmi -f gurpartap/guestbook-example-build
+docker rmi -f gurpartap/guestbook-example

examples/guestbook-go/src/busybox-image/script/push.sh

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+#!/bin/sh
+# Usage: ./push.sh [TAG]
+
+docker push gurpartap/guestbook-example:${1:-latest}

examples/guestbook-go/src/busybox-image/script/release.sh

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+#!/bin/bash
+# Usage: ./release.sh [TAG]
+
+set +e
+
+DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+
+echo " ---> Building..."
+sh $DIR/build.sh
+
+echo " ---> Pushing gurpartap/guestbook-example:${1:-latest}..."
+sh $DIR/push.sh $1
+
+echo " ---> Cleaning up..."
+sh $DIR/clean.sh
+
+echo " ---> Done."