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Modified docker compose file for Lemmy

Hi all! This is my first real post on the fediverse, coming to you live from my own Lemmy instance, which took me way too long to set up. Turns out, the provided `docker-compose.yml` file provided by the official Lemmy documentation does not allow outbound access to the internet, which prevents users from seeing other instances on yours. For SEO's sake, I was receiving the following error message: `error trying to connect: dns error: failed to lookup address information: Try again` Anywho, I updated the `docker-compose.yml` file to put all containers on one network, and allow that network outbound access while restricting inbound access to only ports 80 and 443, which worked a treat. ``` version: "3.3" networks: lemmy: internal: false services: proxy: image: nginx:1-alpine networks: - lemmy ports: # only ports facing any connection from outside - 80:80 - 443:443 volumes: - ./nginx.conf:/etc/nginx/nginx.conf:ro # setup your certbot and letsencrypt config - ./certbot:/var/www/certbot - ./letsencrypt:/etc/letsencrypt/live restart: always depends_on: - pictrs - lemmy-ui lemmy: image: dessalines/lemmy:0.17.4 hostname: lemmy networks: - lemmy restart: always environment: - RUST_LOG="warn,lemmy_server=info,lemmy_api=info,lemmy_api_common=info,lemmy_api_crud=info,lemmy_apub=info,lemmy_db_schema=info,lemmy_db_views=info,lemmy_db_views_actor=info,lemmy_db_views_moderator=info,lemmy_routes=info,lemmy_utils=info,lemmy_websocket=info" volumes: - ./lemmy.hjson:/config/config.hjson depends_on: - postgres - pictrs lemmy-ui: image: dessalines/lemmy-ui:0.17.4 networks: - lemmy environment: # this needs to match the hostname defined in the lemmy service - LEMMY_UI_LEMMY_INTERNAL_HOST=lemmy:8536 # set the outside hostname here - LEMMY_UI_LEMMY_EXTERNAL_HOST=localhost:1236 - LEMMY_HTTPS=true depends_on: - lemmy restart: always pictrs: image: asonix/pictrs:0.3.1 # this needs to match the pictrs url in lemmy.hjson hostname: pictrs # we can set options to pictrs like this, here we set max. image size and forced format for conversion # entrypoint: /sbin/tini -- /usr/local/bin/pict-rs -p /mnt -m 4 --image-format webp networks: - lemmy environment: - PICTRS__API_KEY=API_KEY user: 991:991 volumes: - ./volumes/pictrs:/mnt restart: always postgres: image: postgres:15-alpine # this needs to match the database host in lemmy.hson hostname: postgres networks: - lemmy environment: - POSTGRES_USER=lemmy - POSTGRES_PASSWORD=password - POSTGRES_DB=lemmy volumes: - ./volumes/postgres:/var/lib/postgresql/data restart: always ```