Digitalocean app platform dockerfile node 20

app-spec.yml

# Just for description purpose
# Make sure you remove the environment_slug and that you add the dockerfile_path

## BEFORE
services:
- environment_slug: node-js
  envs:
   ...
   
## AFTER
services:
- envs:
   ...
  dockerfile_path: Dockerfile

docker-compose.yml

version: '3.7'

services:
  ts-node-docker:
    build:
      context: .
      dockerfile: Dockerfile
      target: base
    volumes:
      - .:/app
    container_name: ts-node-docker
    expose:
      - '3000'
    ports:
      - '3000:3000'
    command: npm run start

Dockerfile

FROM node:20 as base

# Create app directory
WORKDIR /app

# Copy lock files
COPY package.json bun.lockb package-lock.json ./

# Install app dependencies
RUN npm ci

# Bundle app source
COPY . /app


# Prod stage
FROM base as production

ENV NODE_PATH=./app

# No need to EXPOSE that is handle by the service running it DO and or docker-compose 

# If you have a build
# RUN npm run build