add example for deploying vm with caddy

examples/threefold/tfgrid3deployer/vm_gw_caddy/Caddyfile

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+:80 { # Set this path to your site's directory.
+root \* /usr/share/caddy
+
+    # Enable the static file server.
+    file_server
+
+    # Another common task is to set up a reverse proxy:
+    # reverse_proxy localhost:8080
+
+    # Or serve a PHP site through php-fpm:
+    # php_fastcgi localhost:9000
+
+}
+
+# Refer to the Caddy docs for more information:
+
+# https://caddyserver.com/docs/caddyfile

examples/threefold/tfgrid3deployer/vm_gw_caddy/install_caddy.sh

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+#!/bin/bash
+
+# Exit immediately if a command exits with a non-zero status
+set -e
+
+# Check if the script is run as root
+if [ "$EUID" -ne 0 ]; then
+  echo "Please run this script as root or using sudo."
+  exit 1
+fi
+
+echo "Updating package lists..."
+apt update -y
+
+echo "Installing prerequisites..."
+apt install -y debian-keyring debian-archive-keyring apt-transport-https curl
+
+echo "Adding Caddy repository..."
+curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' | apt-key add -
+curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' | tee /etc/apt/sources.list.d/caddy-stable.list
+
+echo "Updating package lists for Caddy..."
+apt update -y
+
+echo "Installing Caddy..."
+apt install -y caddy
+
+
+echo "exec: caddy run --config /etc/caddy/Caddyfile" > /etc/zinit/caddy.yaml
+zinit monitor caddy

examples/threefold/tfgrid3deployer/vm_gw_caddy/vm_gw_caddy.vsh

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+#!/usr/bin/env -S v -gc none -no-retry-compilation -cc tcc -d use_openssl -enable-globals -cg run
+
+import freeflowuniverse.herolib.threefold.gridproxy
+import freeflowuniverse.herolib.threefold.tfgrid3deployer
+import freeflowuniverse.herolib.installers.threefold.griddriver
+import os
+import time
+
+mut installer := griddriver.get()!
+installer.install()!
+
+v := tfgrid3deployer.get()!
+println('cred: ${v}')
+deployment_name := 'vm_gw_caddy'
+
+mut deployment := tfgrid3deployer.new_deployment(deployment_name)!
+deployment.add_machine(
+	name:       'vm_caddy'
+	cpu:        1
+	memory:     2
+	planetary:  true
+	public_ip4: true
+	size:       10 // 10 gig
+	mycelium:   tfgrid3deployer.Mycelium{}
+)
+deployment.deploy()!
+
+vm1 := deployment.vm_get('vm_caddy')!
+println('vm1 info: ${vm1}')
+
+vm1_public_ip4 := vm1.public_ip4.all_before('/')
+deployment.add_webname(name: 'mywebname', backend: 'http://${vm1_public_ip4}:80')
+deployment.deploy()!
+
+// Retry logic to wait for the SSH server to be up
+max_retries := 10
+mut retries := 0
+mut is_ssh_up := false
+
+for {
+	if retries < max_retries {
+		// Try to SSH into the machine
+		ssh_check_cmd := 'ssh -o "StrictHostKeyChecking no" root@${vm1_public_ip4} -o ConnectTimeout=10 echo "SSH server is up"'
+		ssh_check_res := os.execute(ssh_check_cmd)
+
+		if ssh_check_res.exit_code == 0 {
+			is_ssh_up = true
+			break
+		}
+		retries++
+		println('SSH server not up, retrying in 5 seconds... (Attempt ${retries}/${max_retries})')
+		time.sleep(time.second * 5)
+	}
+}
+
+if !is_ssh_up {
+	panic('Failed to connect to the SSH server after ${max_retries} attempts.')
+}
+
+cp_cmd := 'scp -o "UserKnownHostsFile=/dev/null" ${os.dir(@FILE)}/install_caddy.sh root@${vm1_public_ip4}:~ && mkdir -p /etc/caddy && scp -o "UserKnownHostsFile=/dev/null" ${os.dir(@FILE)}/Caddyfile root@${vm1_public_ip4}:/etc/caddy/'
+res1 := os.execute(cp_cmd)
+if res1.exit_code != 0 {
+	panic('failed to copy files: ${res1.output}')
+}
+
+cmd := 'ssh root@${vm1_public_ip4} -t "chmod +x ~/install_caddy.sh && ~/setup.sh" -o "UserKnownHostsFile=/dev/null"'
+res := os.execute(cmd)
+if res.exit_code != 0 {
+	panic('failed to install and run caddy: ${res.output}')
+}
+
+println('To access the machine, run the following command:')
+println('ssh root@${vm1_public_ip4}')