docs: add guide to setup windows machine for WSL

Add guide to setup windows machine for running our
integration tests on WSL instances

dev-docs/howtoguides/how_to_setup_windows_machine_for_wsl_testing.md

@@ -0,0 +1,194 @@
+# How to set up a Windows machine for WSL testing
+
+To run our integration tests on Windows Subsystem for Linux (WSL) instances, we need to first set up
+a Windows machine that will allow us to launch the WSL instances. After that, we also need to set up
+an OpenSSH server so we can run SSH commands on the Windows machine.
+
+This guide presents all the necessary steps for the set up, from launching the Windows 11 Pro
+image in Azure to testing if WSL is correctly working on the machine.
+
+## Launching the image on Azure
+
+When launching the Windows instance on Azure, there are a few configurations that need to be performed,
+otherwise we will not be able to launch WSL instances.
+
+First of all, name the machine as `wsl-test`. Currently, this is the name we expect on the
+integration tests.
+
+After that, select the `Windows 11` image and mark the `Security Type` as *Standard*.
+![](windows-security-type.png)
+
+The alternative "Trusted Launch" [doesn't support Nested Virtualization](https://learn.microsoft.com/en-us/azure/virtual-machines/trusted-launch#unsupported-features),
+required to run WSL.
+
+Set a username and password for the VM. Please set the username as *ubuntu*. 
+We will use this account setting to manually log into the machine to run some commands there directly.
+![](windows-ssh-setup.png)
+
+Also, remember to also select the SSH inbound port for the machine
+![](windows-setup-port.png)
+
+Finally, you will need to check this checkbox here:  
+![](windows-license-check.png)
+
+We have already confirmed with the WSL team that our Azure accounts have the proper license to
+launch the Windows machine.
+
+
+## Configure Bastion to log into the machine
+
+To log into the machine and access its GUI, you need to set up Bastion.
+After launching the machine, go for the *Connect via Bastion* option:
+
+![](windows-bastion.png)
+
+![](windows-deploy-bastion.png)
+
+After deploying the Bastion, you just need to present your username and password to log into the
+machine.
+
+## Configuring Hyper-V
+
+After logging into the machine through Bastion, you need to configure Hyper-V by following
+this [tutorial](https://learn.microsoft.com/en-us/azure/lab-services/how-to-enable-nested-virtualization-template-vm-using-script?tabs=powershell)
+
+## Installing winget
+
+Each WSL Ubuntu distro has a dedicated installer in the Microsoft store. Therefore, before launching
+any WSL instance, we need to install the installers first. To achieve that, we need to configure
+**winget**.
+
+To install it on the machine, follow this [tutorial](https://winget.pro/winget-install-powershell/)
+
+```
+Note that you can paste the commands in Bastion by using the clipboard feature that can be found
+under this arrow:
+```
+
+![](windows-bastion-clipboard.png) ![](windows-bastion-clipboard-paste.png)
+
+```
+Finally, if you see the following error during installation, restart the machine first:
+
+Add-AppxPackage : Deployment failed with HRESULT: 0x80073D02, The package could not be installed
+because resources it modifies are currently in use. 
+```
+
+## Installing WSL
+
+To install WSL, just run the following command, as an administrator, on powershell:
+
+```console
+$ wsl --install
+```
+
+After that, we need to update WSL to the pre-release version by running:
+
+```console
+$ wsl --update --pre-release
+```
+
+
+```{note}
+We are installing the pre-release version because it allow us to directly run wsl commands
+through SSH. Once that fix is officially release, we will no longer need to install the
+pre-release version.
+```
+
+Now, install a Bionic instance to test the whole WSL set up is working as expected:
+
+```console
+$ winget install --name "Ubuntu 18.04 LTS" --accept-source-agreements --accept-package-agreements --silent
+```
+
+Now, create the instance with:
+
+```console
+$ & ubuntu1804.exe install --root
+```
+
+After that, just test to see if we can run commands on the WSL instance:
+
+```console
+$ wsl -d Ubuntu-18.04 --exec lsb_release -a
+```
+
+## Installing OpenSSH server
+
+To install OpenSSH server, follow these steps:
+
+1) Open *Settings*
+2) Go to *System*
+3) Go to *Optional Features*
+4) Go to *Add an optional feature*
+5) Search for *ssh*
+6) Install OpenSSH Server
+
+After installing the Service, open PowerShell and launch it by running:
+
+```console
+$ Start-Service sshd
+```
+
+And set it to automatically start after boot:
+
+```console
+$ Set-Service -Name sshd -StartupType 'Automatic'
+```
+
+### Configure the SSH keys
+
+We need to add a SSH public key into the Windows machine.
+
+To do that, follow these steps:
+
+1) Create a public key to be used in the Windows machine (You can also reuse an existing key if you want to)
+
+2) Set the **UACLIENT_BEHAVE_WSL_IP_ADDRESS** environment variable with the Windows machine IP address. 
+This variable will be used in the integration test, but we will already use it in one of the
+following steps.
+
+2) Send the public key to the Windows machine:
+
+```console
+$ scp PUB_KEY_PATH ubuntu@$UACLIENT_BEHAVE_WSL_IP_ADDRESS:C:\\ProgramData\\ssh
+```
+
+3) SSH into the Windows machine. Note that this SSH will ask you for the password you have set up during the Windows image creation.
+4) Run the following commands:
+
+```console
+$ cd %programdata%/ssh
+```
+
+```console
+$ type PUB_KEY_NAME >> administrators_authorized_keys
+```
+
+```console
+$ icacls administrators_authorized_keys /inheritance:r /grant "Administrators:F" /grant "SYSTEM:F"
+```
+
+Now test SSH into the machine using your private key
+
+## Configure the machine for automatic login
+
+To properly run **winget** commands after a machine reboot, a user
+needs to be already logged into the machine. To automate that process,
+follow this [tutorial](https://learn.microsoft.com/en-us/troubleshoot/windows-server/user-profiles-and-logon/turn-on-automatic-logon#use-registry-editor-to-turn-on-automatic-logon)
+
+Note that you also need to manually create the **DefaultUserName** and **DefaultPassword** files.
+
+## Running the integration test
+
+After this set up, you should be able to use that machine to run the WSL tests automatically.
+Before running a WSL test, remember to set the following environment variables:
+
+* **UACLIENT_BEHAVE_WSL_IP_ADDRESS**
+* **UACLIENT_BEHAVE_WSL_PRIVKEY_PATH**
+* **UACLIENT_BEHAVE_WSL_PUBKEY_PATH**
+
+Note that this variables must be set on our local machine. The integration test setup will use them
+to stablish the connection with the Windows host machine to create the WSL instances the tests will
+run on.
+