Add script to build Docker image.

build-image.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -e -u -o pipefail
+
+readonly REPO=spaceapi-server
+TAG=$(git rev-parse --short HEAD)
+readonly TAG
+readonly IMAGE="${REPO}:${TAG}"
+
+docker build -t "${IMAGE}" .