aider: Add --add-host flag to docker run command to allow container to connect to host machine on macOS using host.docker.internal.

# Aider chat conversation:

USER: when i run `curl http://127.0.0.1:11434` inside the container, it "Couldn't connect to server". i want it to connect to the server running on the host computer on that port. the host is a mac.

ASSISTANT: To allow the Docker container to connect to the host machine on macOS, you can use the special DNS name `host.docker.internal` which resolves to the internal IP address used by the host. This is a feature provided by Docker for Mac to facilitate such connections.

Here's the diff to update the `docker.sh` script to include the `--add-host` flag, which adds an entry to the container's `/etc/hosts` file:

```diff
--- benchmark/docker.sh
+++ benchmark/docker.sh
@@ ... @@
 docker run \
        -it --rm \
        -v `pwd`:/aider \
        -v `pwd`/tmp.benchmarks/.:/benchmarks \
        -e OPENAI_API_KEY=$OPENAI_API_KEY \
        -e HISTFILE=/aider/.bash_history \
        -e AIDER_DOCKER=1 \
        -e AIDER_BENCHMARK_DIR=/benchmarks \
+       --add-host=host.docker.internal:host-gateway \
        --net=host \
        -p 11434:11434 \
        aider-benchmark \
        bash
```

With this change, when you run `curl http://host.docker.internal:11434` inside the container, it should connect to the server running on the host computer on that port.

benchmark/docker.sh

@@ -8,6 +8,7 @@ docker run \
        -e HISTFILE=/aider/.bash_history \
        -e AIDER_DOCKER=1 \
        -e AIDER_BENCHMARK_DIR=/benchmarks \
+       --add-host=host.docker.internal:host-gateway \
        --net=host \
        -p 11434:11434 \
        aider-benchmark \