(Inside the docker container, "http://signal-cli-rest-api:8080" can be resolved to the host of the other docker container. Outside not.)
### Link the signal-cli bot
Start containers:
```
docker compose up -d
```
In the beginning, this will only start the `signal-cli-rest-api` docker container. The other container will fail, since the `signal-cli` is not linked to the account. If you already activated the phone number with another signal device, you can register the new device.