add(Docker): Docs for mining with Docker (#7179)

* Add docs for mining with Docker

* Refactor the docs for mining with Docker

* Add a note on syncing

book/src/SUMMARY.md

@@ -15,6 +15,7 @@
   - [zk-SNARK Parameters](user/parameters.md)
   - [Mining](user/mining.md)
     - [Testnet Mining with s-nomp](user/mining-testnet-s-nomp.md)
+    - [Mining with Zebra in Docker](user/mining-docker.md)
   - [Kibana blockchain explorer](user/elasticsearch.md)
   - [Troubleshooting](user/troubleshooting.md)
 - [Developer Documentation](dev.md)

book/src/user/mining-docker.md

@@ -0,0 +1,45 @@
+# Mining with Zebra in Docker
+
+Some of our published [Docker images](https://hub.docker.com/r/zfnd/zebra/tags)
+have the `.experimental` suffix in their name. We compile these images with the
+`getblocktemplate-rpcs` feature, and you can use them for your mining
+operations. For example, executing
+
+```bash
+docker run -e MINER_ADDRESS="t1XhG6pT9xRqRQn3BHP7heUou1RuYrbcrCc" -p 8232:8232 zfnd/zebra:v1.1.0.experimental
+```
+
+will start a container on Mainnet and bind port 8232 on your Docker host. If you
+want to start generating blocks, you need to let Zebra sync first.
+
+Note that you must pass the address for your mining rewards via the
+`MINER_ADDRESS` environment variable when you are starting the container, as we
+did in the example above. The address we used starts with the prefix `t1`,
+meaning it is a Mainnet P2PKH address. Please remember to set your own address
+for the rewards.
+
+The port we mapped between the container and the host with the `-p` flag in the
+example above is Zebra's default Mainnet RPC port. If you want to use a
+different one, you can specify it in the `RPC_PORT` environment variable,
+similarly to `MINER_ADDRESS`, and then map it with the Docker's `-p` flag.
+
+Instead of listing the environment variables on the command line, you can use
+Docker's `--env-file` flag to specify a file containing the variables. You
+can find more info here
+https://docs.docker.com/engine/reference/commandline/run/#env.
+
+## Mining on Testnet
+
+If you want to mine on Testnet, you need to set the `NETWORK` environment
+variable to `Testnet` and use a Testnet address for the rewards. For example,
+running
+
+```bash
+docker run -e NETWORK="Testnet" -e MINER_ADDRESS="t27eWDgjFYJGVXmzrXeVjnb5J3uXDM9xH9v" -p 18232:18232 zfnd/zebra:v1.1.0.experimental
+```
+
+will start a container on Testnet and bind port 18232 on your Docker host, which
+is the standard Testnet RPC port. Notice that we also used a different rewards
+address. It starts with the prefix `t2`, indicating that it is a Testnet
+address. A Mainnet address would prevent Zebra from starting on Testnet, and
+conversely, a Testnet address would prevent Zebra from starting on Mainnet.