Build sqlitelua for scalar, aggregate & table-valued UDFs in Lua (#118)

* Update base Docker images

* Use performance.now() instead of Date.now() for time promise tests

* Build sqlitelua: user scalar, aggregate & table-valued functions in Lua

Dockerfile.test

@@ -3,7 +3,7 @@
 #     docker build -t sqliteviz/test -f Dockerfile.test .
 #
 
-FROM node:12
+FROM node:12.22-buster
 
 RUN set -ex; \
     apt update; \