Mattermost docker-compose file without building, with ephemeral storage only - for testing. Starts in a minute from "docker-compose up"

docker-compose.yml

version: "3"

services:

  db:
    image: mattermost/mattermost-prod-db
    read_only: true
    restart: unless-stopped
    volumes:
      - /etc/localtime:/etc/localtime:ro
    environment:
      - POSTGRES_USER=mmuser
      - POSTGRES_PASSWORD=mmuser_password
      - POSTGRES_DB=mattermost
    # uncomment the following to enable backup
    #  - AWS_ACCESS_KEY_ID=XXXX
    #  - AWS_SECRET_ACCESS_KEY=XXXX
    #  - WALE_S3_PREFIX=s3://BUCKET_NAME/PATH
    #  - AWS_REGION=us-east-1

  app:
    image: mattermost/mattermost-prod-app
    restart: unless-stopped
    volumes:
      - /etc/localtime:/etc/localtime:ro
      # When you want to use SSO with GitLab, you have to add the cert pki chain of GitLab inside Alpine
      # to avoid Token request failed: certificate signed by unknown authority (link: https://github.com/mattermost/mattermost-server/issues/13059)
      # - <path_to_your_gitlab_pki>/pki_chain.pem:/etc/ssl/certs/pki_chain.pem:ro
    environment:
      # set same as db credentials and dbname
      - MM_USERNAME=mmuser
      - MM_PASSWORD=mmuser_password
      - MM_DBNAME=mattermost

      # use the credentials you've set above, in the format:
      # MM_SQLSETTINGS_DATASOURCE=postgres://${MM_USERNAME}:${MM_PASSWORD}@db:5432/${MM_DBNAME}?sslmode=disable&connect_timeout=10
      - MM_SQLSETTINGS_DATASOURCE=postgres://mmuser:mmuser_password@db:5432/mattermost?sslmode=disable&connect_timeout=10

      # in case your config is not in default location
      #- MM_CONFIG=/mattermost/config/config.json

  web:
    image: mattermost/mattermost-prod-web
    ports:
      - "80:80"
      - "443:443"
    read_only: true
    restart: unless-stopped
    volumes:
      # This directory must have cert files if you want to enable SSL
      - /etc/localtime:/etc/localtime:ro