Add script to demo search-server's docker usage.

scripts/search-server.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -eu
+
+PORT=${PORT:-3001}
+
+cd "$(dirname "$0")/search-server"
+
+docker build -t search-server .
+
+cd ../../_gen/notes/
+
+set -x
+
+exec docker run -it --rm -p $PORT:80 -e PORT=80 -e DB_PATH=/db.sqlite3 -v `pwd`/db.sqlite3:/db.sqlite3:ro search-server