add test to build the default site

script/cibuild

@@ -9,6 +9,7 @@ then
   script/fmt
   script/test ci
   script/cucumber
+  script/default-site
 elif [[ -x "script/$TEST_SUITE" ]]
 then
   script/$TEST_SUITE

script/default-site

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+# Runs the `jekyll new` command and builds the default site as a sanity check
+
+set -e
+
+mkdir -p ./tmp
+rm -Rf ./tmp/default-site
+
+bundle exec jekyll new tmp/default-site
+cd tmp/default-site
+
+bundle exec jekyll build --verbose