message: Use node 10 for Express docker base container
diff: -FROM node:lts AS builder
  +FROM node:10 AS builder
  MAINTAINER Tyler Levine <tyler@bitgo.com>
  COPY --chown=node:node . /tmp/bitgo/
  WORKDIR /tmp/bitgo/modules/express
  USER node
  RUN npm ci && npm prune --production
  -FROM node:lts-alpine
  +FROM node:10-alpine
  RUN apk add --no-cache tini
  COPY --from=builder /tmp/bitgo/modules/express /var/bitgo-express
  ENV NODE_ENV production
  