feat: add Caddy install script for Debian/Ubuntu/Raspbian

install-caddy.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+set -euo pipefail
+
+# Install Caddy web server on Debian/Ubuntu/Raspbian using the official
+# Cloudsmith apt repository.
+# Follows the official docs:
+#   https://caddyserver.com/docs/install#debian-ubuntu-raspbian
+
+if [ "$EUID" -ne 0 ]; then
+  echo "Please run as root (sudo)." >&2
+  exit 1
+fi
+
+. /etc/os-release
+
+case "$ID" in
+  debian|ubuntu|raspbian) ;;
+  *)
+    echo "Unsupported distribution: $ID (only Debian, Ubuntu and Raspbian are supported)." >&2
+    exit 1
+    ;;
+esac
+
+ARCH="$(dpkg --print-architecture)"
+case "$ARCH" in
+  amd64|arm64|armhf) ;;
+  *)
+    echo "Unsupported architecture: $ARCH" >&2
+    exit 1
+    ;;
+esac
+
+export DEBIAN_FRONTEND=noninteractive
+
+echo "==> Installing prerequisites"
+apt-get update
+apt-get install -y debian-keyring debian-archive-keyring apt-transport-https curl
+
+echo "==> Adding Caddy's official GPG key"
+curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' | gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
+chmod o+r /usr/share/keyrings/caddy-stable-archive-keyring.gpg
+
+echo "==> Adding Caddy apt repository"
+curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' | tee /etc/apt/sources.list.d/caddy-stable.list >/dev/null
+chmod o+r /etc/apt/sources.list.d/caddy-stable.list
+
+echo "==> Installing Caddy"
+apt-get update
+apt-get install -y caddy
+
+echo "Caddy installed. Service status: systemctl status caddy"