Mount volume to a Docker app

Hello! I have a Docker application with Node.JS inside which is launched as an App. I’d like to mount a Volume to the App, how can I do this? I have Dockerfile and app.yaml:

app.yaml:

name: media-server
services:
  - dockerfile_path: Dockerfile
    github:
      branch: master
      deploy_on_push: true
      repo: name/media-server
    name: node
    http_port: 3010

Dockerfile:

FROM node:16-alpine as builder
RUN apk add --update --no-cache file imagemagick
RUN mkdir -p /home/node/app/node_modules && chown -R node:node /home/node/app
WORKDIR /home/node/app
COPY package.json yarn.lock ./
USER node
RUN yarn install
COPY --chown=node:node . .
RUN yarn build
CMD ["yarn", "start"]
EXPOSE 3010

Thank you in advance!