add build.sh script for docker builds

Author: spigwitmer

build.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+BUILDENV_IMG_NAME=${1:-piutools_buildenv}
+BUILDENV_IMG_VERSION=${2:-latest}
+
+repo_name="${BUILDENV_IMG_NAME}:${BUILDENV_IMG_VERSION}"
+
+GID="$(id -g ${UID})"
+
+docker build -t ${repo_name} .
+docker run --rm -v $PWD:/piutools \
+    -e "CFLAGS=${CFLAGS:-""}" \
+    -e "MY_UID=${UID}" \
+    -e "MY_GID=${GID}" \
+    ${repo_name} make