docker compose file for a matrix sliding sync proxy

docker-compose.yaml

version: "3"

services:

  sliding-proxy:
    image: ghcr.io/matrix-org/sliding-sync:v0.99.1
    restart: unless-stopped
    ports:
      - "127.0.0.1:8881:8881"
    environment:
      - "SYNCV3_SECRET=<long random string>"
      - "SYNCV3_SERVER=https://your.home.server"
      - "SYNCV3_DB=user=syncv3 dbname=syncv3 sslmode=disable host=sliding-postgres password=hunter2"
      - "SYNCV3_BINDADDR=0.0.0.0:8881"
    depends_on:
      - sliding-postgres

  sliding-postgres:
    image: docker.io/postgres:15-alpine
    restart: unless-stopped
    environment:
      - "POSTGRES_USER=syncv3"
      - "POSTGRES_PASSWORD=hunter2"
      - "POSTGRES_DB=syncv3"
    volumes:
      - sliding_db_data:/var/lib/postgresql/data

volumes:
  sliding_db_data:

Hello, let's say that I have followed steps to self host matrix from here on this machine B (connected using ssh from machine A)
This is docker-compose.yaml

This is homeserver.yaml

Now, I'm not sure how to configure your docker-compose file so that it works in my case.
Also, I want to know how to do the same but using the docker image from here
This is what I'm trying to run but it timeout everytime
docker run --rm -e "SYNCV3_SERVER=machineB_IP_Adress" -e "SYNCV3_SECRET=$(cat .secret)" -e "SYNCV3_BINDADDR=:8008" -e "SYNCV3_DB=user=USER dbname=syncv3 sslmode=disable host=machineA_IP_Adress password='PASSWORD'" -p 8009:8008 ghcr.io/matrix-org/sliding-sync:latest