added build script for container (buildah)

Makefile

@@ -1,11 +1,10 @@
-#GOFLAGS=""
 LDFLAGS=-ldflags "-s -w"
 BINARY=metrorama
 
 .DEFAULT_GOAL: $(BINARY)
 
 $(BINARY): clean
-	go build ${GOFLAGS} ${LDFLAGS} -o ${BINARY}
+	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build ${GOFLAGS} ${LDFLAGS} -o ${BINARY}
 
 install:
 	go install ${GOFLAGS} ${LDFLAGS} -o ${BINARY}

build.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# Remember to run buildah unshare before launching this
+# Build container
+echo "Start creating first stage "
+buildctrl=$(buildah from golang:1.15.2)
+buildmnt=$(buildah mount $buildctrl)
+
+buildah copy $buildctrl *.go .
+buildah copy $buildctrl Makefile .
+buildah run $buildctrl make deps
+buildah run $buildctrl make
+
+# Runtime container
+echo "Start creating second stage"
+buildctrl2=$(buildah from alpine:latest)
+buildmnt2=$(buildah mount $builctrl2)
+
+buildah copy $buildctrl2 $buildmnt/go/metrorama 
+buildah config --cmd ./metrorama $buildctrl2
+buildah config --port 8080 $buildctrl2
+buildah unmount $buildctrl
+buildah unmount $buildctrl2
+buildah commit $buildctrl2 metrorama:latest
+buildah rm $buildctrl $buildctrl2