Add linting steps and improve testing steps

scripts/test.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env sh
+# test.sh -- Simple build test.
+
+set -eu
+
+main() {
+  cd "$(dirname "$0")/.."
+
+  # The main goal here is to ensure that the build fully completed and the
+  # result looks usable.
+  version=$(node ./build/out/node/entry.js --version --json)
+  echo "Got '$version' for the version"
+  case $version in
+    "{ codeServer":*) exit 0 ;;
+    *) exit 1 ;;
+  esac
+}
+
+main "$@"