added docker hero mdbook steps

docs/hero_mdbook_docker.md

@@ -0,0 +1,70 @@
+<h1>Deploy mdBook with Hero on Docker</h1>
+
+<h2>Table of Contents</h2>
+
+- [Introduction](#introduction)
+- [Prerequisites](#prerequisites)
+- [Steps](#steps)
+- [Questions and Feedback](#questions-and-feedback)
+
+---
+
+## Introduction
+
+We give the basic steps to use Hero on Docker to run and create mdBooks.
+
+## Prerequisites
+
+- Docker engine should be installed and running
+- You need a git repository to work with (here we use **info_tfgrid**)
+  - Clone the hero mdbook repo on your local machine and note the path
+
+## Steps
+
+In this setup, we will have two temrinal windows running. One window running the **docker run** command and the other running the **docker exec** command. Steps are shown in details.
+
+Note that you will need to adjust the local path of the git repo and the docker path of the git repo.
+
+- On a terminal window, start Hero docker
+  ```
+  sudo docker run --name herodocker -v /local/machine/path/to/git/repo:/docker/path/to/git/repo/ ghcr.io/scottyeager/hero:latest
+  ```
+  - In our case, the docker path to the repo is the following
+    ```
+    /root/code/git.ourworld.tf/tfgrid/info_tfgrid/
+    ```
+- Open a new terminal window and enter the following. We will be working on this window now.
+  ```
+  sudo docker exec -it herodocker bash
+  ```
+- Set git globally with a safe directory
+  ```
+  git config --global --add safe.directory /root/code/git.ourworld.tf/tfgrid/info_tfgrid
+  ```
+- You can now use hero normally, e.g. with **projectinca**:
+  ```
+  hero mdbook -u https://git.ourworld.tf/tfgrid/info_tfgrid/src/branch/main/heroscript/projectinca -gp
+  ```
+- To view the mdbook on your local browser, run the lines:
+  ```
+  cd ~/hero/var/mdbuild/projectinca/
+  mdbook serve -n 0.0.0.0
+  ```
+- You should be able to view the rendered book at
+  ```
+  http://172.17.0.2:3000/
+  ```
+- To stop the container, exit the current window and run the following:
+    ```
+    sudo docker stop herodocker
+    ```
+  - The first terminal window that was running **docker run** should now have exited Docker.
+- To start Hero after having stopped the container, run the following:
+  ```
+  sudo docker start herodocker
+  ```
+  - You can now run the previous line **docker exec** and continue your work.
+
+## Questions and Feedback
+
+If you have any questions or feedback, please let us know by either writing a post on the [ThreeFold Forum](https://forum.threefold.io/), or by chatting with us on the [TF Grid Tester Community](https://t.me/threefoldtesting) Telegram channel.