Adds a Makefile to make the virtual box creation, start and app run

reproducible.
This allows to develop PWD on a container, which is nice and also
necessary once "reverse proxy" feature is introduced.

Makefile

@@ -0,0 +1,30 @@
+# Prepares the virtual box instance
+prepare:
+	# Creates the virtual box
+	-docker-machine create -d virtualbox --virtualbox-boot2docker-url https://github.com/boot2docker/boot2docker/releases/download/v1.13.0-rc1/boot2docker.iso pwd && true
+	# Makes sure the docker daemon has the DinD image pulled
+	-docker-machine ssh pwd "docker pull franela/pwd-1.12.3-experimental-dind"
+	# Daemon should be swarm
+	-docker-machine ssh pwd "docker swarm init --advertise-addr $$(docker-machine ip pwd)"
+	# Stops to daemon to do further configurations on the box
+	-docker-machine stop pwd
+	# Adds the host GOPATH as a shared folder in the box
+	-VBoxManage sharedfolder add pwd --name gopathsrc --hostpath ${GOPATH}src --automount
+	# Do port forwaring so we can reach the app using localhost:3000
+	-VBoxManage modifyvm pwd --natpf1 "nameformapping,tcp,,3000,,3000"
+
+# Starts the virtual box instance
+start:
+	# Starts the machine
+	-docker-machine start pwd
+	# Make sure the folder where we'll mount the shared folder exists
+	docker-machine ssh pwd "sudo mkdir -p /go/src"
+	# Mount the host's GOPATH shared folder
+	docker-machine ssh pwd "sudo mount -t vboxsf gopathsrc /go/src"
+
+# Runs the app
+run:
+	@eval $$(docker-machine env pwd); \
+	docker-compose up
+
+.PHONY: prepare start run

docker-compose.yml

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+version: '2'
+services:
+    web:
+        # use the latest golang image
+        image: golang
+        # go to the right place and starts the app
+        command: /bin/sh -c 'cd /go/src/github.com/franela/play-with-docker; go run api.go'
+        ports:
+            # app exposes port 3000
+            - "3000:3000"
+        volumes:
+            # since this app creates networks and launches containers, we need to talk to docker daemon
+            - /var/run/docker.sock:/var/run/docker.sock
+            # mount the box mounted shared folder to the container
+            - /go/src:/go/src