Add local buildkite CI runner

ci/run-local.sh

@@ -0,0 +1,19 @@
+#!/bin/bash -e
+#
+# Run the entire buildkite CI pipeline locally for pre-testing before sending a
+# Github pull request
+#
+
+cd "$(dirname "$0")/.."
+BKRUN=ci/node_modules/.bin/bkrun
+
+if [[ ! -x $BKRUN ]]; then
+  (
+    set -x
+    cd ci/
+    npm install bkrun
+  )
+fi
+
+set -x
+./ci/node_modules/.bin/bkrun ci/buildkite.yml