Added tutorial for using cloudflared (#922)

* Added tutorial for using cloudflared

This provides a remote access solution that doesn't rely on port forwarding or requiring any software to be installed on the remote pc.

* Updated to use latest release sourcecode

Removed the requirement to use git to pull code and streamlined for more automated builds.

docs/cloudflared.md

@@ -0,0 +1,78 @@
+# Cloudflare Tunnels
+
+[Cloudflare Tunnels](https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/) can be used to access PiKVM over the internet securely using Cloudflare Zero Trust with the ```cloudflared``` daemon. This is a convenient and free (for private use) tool for allowing access to web services running on your internal network without port forwarding or IPv4/IPv6 compatability issues. This document is provided as an example for accessing your pikvm over the internet but you can also use zerotier/tailscale/insert xyz vpn service here. Basic support like whats shown below is provided as an example, any other setting or functionality needs to be redirected to the appropriate community.
+
+## Prequisites
+  
+1. A domain utilizing Cloudflare for DNS
+2. A Cloudflare tunnel configured with an application created and secured by an access policy
+
+## Cloudflare Tunnel Steps
+
+1. Login to Cloudflare and provision a tunnel using the steps [here](https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/install-and-setup/tunnel-guide/remote/). Save the tunnel token as we will need this later. In most cases the target will be https://localhost 
+2. Create a self-hosted application with the url matching one created in the previous step by following the steps [here](https://developers.cloudflare.com/cloudflare-one/applications/configure-apps/self-hosted-apps/). 
+   * You will need to check the http options to disable SSL certificate verification under Tunnels -> Configure -> Public Hostname -> yourapplication.yourdomain -> Edit -> TLS Settings -> No TLS Verify as the PiKVM uses self-signed certificates.
+
+   * Don't skip the access policies as this important to preventing randoms from the internet from gaining access to your PiKVM. Cloudflare offers a variety of login options with the simplest being One-time PINs that are emailed to you. NOTE: This external authentication will not replace the username/password for the PiKVM but instead supplement it acting as a first line of defense from the internet.
+  
+## Installation
+
+Unfortunately Cloudflare does not provide binaries for armv7hf so we need to compile from source to generate a working build. 
+
+### On the PiKVM side
+
+1. Use these commands:
+
+    ```
+    # rw
+    # pacman -Syu go
+    # curl -s https://api.github.com/repos/cloudflare/cloudflared/releases/latest | grep "tarball_url" | cut -d '"' -f 4 | xargs curl -LJo cloudflared-latest.tar.gz
+    # tar -xzvf cloudflared-latest.tar.gz --transform 's|[^/]*/|cloudflared/|'
+    # cd cloudflared/cmd/cloudflared/
+    # go build
+    # mv cloudflared /usr/bin/cloudflared
+    # cloudflared version
+    ```
+
+2. Create the service configuration file
+   
+   ```
+   # systemctl edit --full cloudflared.service
+   ```
+
+3. Insert the following configuration replacing TOKEN VALUE with your token from the Cloudflare tunnel step.
+
+   ```
+   [Unit]
+   Description=Cloudflare Tunnel
+   After=network.target
+   
+   [Service]
+   TimeoutStartSec=0
+   Type=notify
+   ExecStart=/usr/bin/cloudflared --protocol quic tunnel run --token <TOKEN VALUE>
+   Restart=on-failure
+   RestartSec=5s
+   ```
+
+4. Afterwards verify service is started and stays running
+
+   ```
+   # systemctl enable --now cloudflared
+   # systemctl status cloudflared
+   ```
+5. Open a web browser and attempt
+
+## Updating cloudflared
+
+1. Use these commands to update the ```cloudflared``` daemon:
+  
+    ```
+    # rw
+    # rm -rf cloudflared/
+    # curl -s https://api.github.com/repos/cloudflare/cloudflared/releases/latest | grep "tarball_url" | cut -d '"' -f 4 | xargs curl -LJo cloudflared-latest.tar.gz
+    # tar -xzvf cloudflared-latest.tar.gz --transform 's|[^/]*/|cloudflared/|'
+    # cd cloudflared/cmd/cloudflared/
+    # go build && mv cloudflared /usr/bin/cloudflared
+    # systemctl restart cloudflared
+    ```

mkdocs.yml

@@ -69,6 +69,7 @@ nav:
         - "Internet access":
             - "Port forwarding": port_forwarding.md
             - "Tailscale VPN": tailscale.md
+            - "Cloudflare Tunnel": cloudflare.md
         - "Setting up Wi-Fi": wifi.md
         - "Let's Encrypt certificates": letsencrypt.md
     - "Video":