add a basic build script for testing

This script can be extended in the future but it uses the containerize
script to ensure we run inside of a working build environment. This
script can be extended to build additional targets for testing.

Signed-off-by: Doug Goldstein <cardoe@cardoe.com>

scripts/build.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Grab the MACHINE from the environment; otherwise, set it to a sane default
+export MACHINE="${MACHINE-qemux86}"
+
+# What to build
+BUILD_TARGETS="\
+    rustfmt \
+    "
+
+die() {
+    echo "$*" >&2
+    exit 1
+}
+
+rm -f build/conf/bblayers.conf || die "failed to nuke bblayers.conf"
+rm -f build/conf/local.conf || die "failed to nuke local.conf"
+
+./scripts/containerize.sh bitbake ${BUILD_TARGETS} || die "failed to build"