docs: Docker Engine on Windows how-to article (#4406)

Author: ppawlowski

docs/install/docker/windows-docker-ce.md

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+---
+navTitle: Docker Engine on Windows
+meta:
+   description: Install Docker Engine (Docker CE) on Windows.
+   tags: 
+       - docker for windows
+       - install docker on windows
+       - install docker on windows with wsl2
+       - running docker on windows 11
+---
+
+# How to Install Docker Engine (Docker CE) on Windows using WSL2
+
+We recommend running FlowFuse Docker on Linux when ever possible as containers are inherently a Linux technology. If that really is not possible in your environment and the base OS must be Windows then the next best option is to use the WSL2 (Windows Subsystem for Linux v2) feature of Windows.
+
+## Prerequisites
+
+Ensure your system meets the following Windows Subsystem for Linux v2 requirements:
+
+- Windows Server 2022
+- Windows 10 version 2004 and higher (Build 19041 and higher)
+- Windows 11
+
+## Step 1: Install Windows Subsystem for Linux 
+
+Open PowerShell as an administrator and run the following commands:
+
+1. Install WSL and the default Linux distribution (Ubuntu) using the following command:
+   ```powershell
+   wsl --install
+   ```
+
+2. Reboot your system to apply changes
+   ```powershell
+   shutdown -r -t 5
+   ```
+
+  After the reboot, WSL will automatically start installing the Ubuntu Linux distribution.
+   You will be prompted to create a new UNIX account. Follow the instructions to create a new user account and set a password.
+   ![wsl-unix-user-creation](../images/wsl-unix-user.png)
+
+   Once completed, you will be dropped into a new Ubuntu shell.
+   ![wsl-install-complete](../images/wsl-install-complete.png)
+
+3. Confirm using proper WSL version, by running (in Powershell window):
+   ```powershell
+   wsl --status
+   ```
+
+## Step 2: Install Docker on Ubuntu
+
+Once the Ubuntu system is ready, follow these steps to install Docker:
+
+1. **Remove Conflicting Packages**
+
+   First, remove any existing Docker packages that might conflict with the installation:
+
+   ```bash
+   for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done
+   ```
+
+2. **Add Docker’s Official GPG Key and APT Repository**
+
+   Next, update your package list and add Docker's official GPG key and APT repository:
+
+   ```bash
+   sudo apt-get update
+   sudo apt-get install ca-certificates curl
+   sudo install -m 0755 -d /etc/apt/keyrings
+   sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
+   sudo chmod a+r /etc/apt/keyrings/docker.asc
+   ```
+
+   Add the Docker repository to your APT sources:
+
+   ```bash
+   echo \
+     "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
+     $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
+     sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+   sudo apt-get update
+   ```
+
+3. **Install Docker Packages**
+
+   Now, install Docker and its associated packages:
+
+   ```bash
+   sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+   ```
+
+4. **Start the Docker Service**
+
+   Start Docker using the following command:
+
+   ```bash
+   sudo /etc/init.d/docker start
+   ```
+
+5. **Verify Docker Installation**
+
+   Run a test Docker container to verify that Docker is installed and running correctly:
+
+   ```bash
+   sudo docker run hello-world
+   ```
+
+   If Docker is installed correctly, you should see a similar output:
+
+   ![wsl-docker-installation-complete](../images/wsl-docker-complete.png)
+
+
+Once Docker is installed, you can [install the FlowFuse platform using docker compose](./README.md).
+
+
+## Optional: Port Forwarding from External IP Address to Docker Container
+
+If you want to forward a port from your external IP address to a Docker container, follow these additional steps.
+
+Consider a scenario where you want to run an Nginx container:
+
+1. **Run the Nginx Container**
+
+   In the Linux shell, start the Nginx container, binding port 8080 on your localhost to port 80 in the container:
+
+   ```bash
+   sudo docker run -d -p 8080:80 --name mynginx nginx
+   ```
+
+2. **Set Up Port Forwarding**
+
+   To forward traffic from an external IP to your container, run the following PowerShell command (administrator privileges required):
+
+   ```powershell
+   netsh interface portproxy add v4tov4 listenport=8080 listenaddress=0.0.0.0 connectport=8080 connectaddress=127.0.0.1
+   ```
+   
+   This command forwards traffic from port 8080 on your external IP address to port 8080 on your localhost, where the Nginx container is listening for connections.
+   The value for `listenport` can be changed as needed.
+
+3. **Open the Port on Your Firewall**
+
+   Ensure that port 8080 (or any other port you specivied as a value for `listenport` in the previous step) is open on your firewall:
+
+   ```powershell
+   New-NetFireWallRule -DisplayName 'WSL 8080TCP' -Direction Inbound -LocalPort 8080 -Action Allow -Protocol TCP
+   New-NetFireWallRule -DisplayName 'WSL 8080TCP' -Direction Outbound -LocalPort 8080 -Action Allow -Protocol TCP
+   ```
+
+4. **Access the Nginx Container** 
+
+   You can now access the Nginx container by visiting `http://<server-external-ip>:8080` in your browser.