Cleaned up a few things and added a make test to do a quick build test

FossilOrigin-Name: 1a21b01b33244f3d652dece381edfb2b3b36744ae4c0ae0fc861b882484b36a1

scripts/build-docker.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+set -euax
+
+## check the usage and get the image to test
+if [ $# -ne 1 ] ; then
+  echo 1>&2 "usage: $0 image"
+  exit 1
+fi
+image=$1
+
+# Get the toplevel directory of the git repo
+repo_dir=`git rev-parse --show-toplevel`
+
+# See if the file for the image is available
+
+if [ ! -f "${repo_dir}/${image}.md" ] ; then
+  echo 1>&2 "could not find the file for ${image}"
+  exit 1
+fi
+
+# Let's try to build it.
+echo "attempting to build ${image} in ${repo_dir}"
+${repo_dir}/scripts/tangle.tcl -R "${image}.dockerfile" "${image}.md" | \
+  docker build -t test:${image} -f - .
+
+exit 0