Add documentation for running history nodes with Docker in mainnet

Add documentation for running history nodes with Docker in mainnet.
This is necessary since history nodes in mainnet need to use the full
genesis file.

This closes #3227.

README.md

@@ -153,8 +153,18 @@ You can also choose to run a validator or a prover node. Check our guides with t
 `docker pull ghcr.io/nimiq/core-rs-albatross:latest`.
 3. Create a `client.toml` file in `~/data` with `cp ./lib/src/config/config_file/client.example.toml ~/data/client.toml`.
 4. Customize the configuration file to match your requirements. Refer to the [sample configuration file](https://github.com/nimiq/core-rs-albatross/blob/albatross/lib/src/config/config_file/client.example.toml) and [configuration settings](#configuration) for guidance.
-5. Run the client via Docker:
-`docker run -v $(pwd)/data:/home/nimiq/.nimiq -p 8443:8443 -p 8648:8648 -p 9100:9100 --name nimiq-rpc --rm ghcr.io/nimiq/core-rs-albatross:latest`.
+5. Run the client via Docker.
+   - If you are running a history node for **mainnet**:
+     1. Make sure to have downloaded the full genesis file as explained in [this section](#history-nodes).
+     2. Copy the full genesis file into the `data` folder: `cp /path/to/nimiq-genesis-main-albatross.toml ~/data`.
+     3. Run the client with the `NIMIQ_OVERRIDE_MAINNET_CONFIG` environment variable:
+        ```
+        docker run -v $(pwd)/data:/home/nimiq/.nimiq -p 8443:8443 -p 8648:8648 -p 9100:9100 -e NIMIQ_OVERRIDE_MAINNET_CONFIG=/home/nimiq/.nimiq/nimiq-genesis-main-albatross.toml --name nimiq-rpc --rm ghcr.io/nimiq/core-rs-albatross:latest
+        ```
+   - If you're not running a history node or not running the client for **mainnet**:
+     ```
+     docker run -v $(pwd)/data:/home/nimiq/.nimiq -p 8443:8443 -p 8648:8648 -p 9100:9100 --name nimiq-rpc --rm ghcr.io/nimiq/core-rs-albatross:latest
+     ```
 
 **Overview of Exposed Ports**
 
@@ -191,4 +201,4 @@ Small note: When editing the README, please conform to the [standard-readme](htt
 
 ## License
 
-This project is licensed under the [Apache License 2.0](./LICENSE.md).
+This project is licensed under the [Apache License 2.0](./LICENSE.md).