Caddy: install the .deb from GitHub instead of the Cloudsmith repo

Cloudsmith answered 402 Payment Required for two days once Caddy's
bandwidth quota ran out, and upstream expects it to happen again
(caddyserver/dist#142). Each GitHub release carries the identical
package (same SHA256), so Debian installs it from there now. The update
drops the Cloudsmith source, seeds ~/.caddy from the installed package
so nothing is reinstalled, and keeps a customised Caddyfile.

ct/caddy.sh

@@ -38,11 +38,19 @@ update_deb_based() {
     exit
   fi
 
+  # The Cloudsmith repo keeps running out of quota (402); the same .deb ships with each GitHub release
+  cleanup_old_repo_files "caddy"
   msg_info "Updating Caddy LXC"
   apt_update_safe
   $STD apt upgrade -y
   msg_ok "Updated Caddy LXC"
 
+  [[ -f ~/.caddy ]] || dpkg-query -W -f='${Version}' caddy >~/.caddy 2>/dev/null || true
+  if check_for_gh_release "caddy" "caddyserver/caddy"; then
+    DPKG_FORCE_CONFOLD=1 fetch_and_deploy_gh_release "caddy" "caddyserver/caddy" "binary" "latest" "/opt/caddy" "caddy_*_linux_$(arch_resolve).deb"
+    systemctl restart caddy
+  fi
+
   if command -v xcaddy >/dev/null 2>&1; then
     if check_for_gh_release "xcaddy" "caddyserver/xcaddy"; then
       setup_go

install/caddy-install.sh

@@ -14,21 +14,8 @@ network_check
 update_os
 
 setup_deb_based() {
-  msg_info "Installing Dependencies"
-  $STD apt install -y \
-    debian-keyring \
-    debian-archive-keyring \
-    apt-transport-https
-  msg_ok "Installed Dependencies"
-
-  msg_info "Installing Caddy"
-  setup_deb822_repo \
-    "caddy" \
-    "https://dl.cloudsmith.io/public/caddy/stable/gpg.key" \
-    "https://dl.cloudsmith.io/public/caddy/stable/deb/debian" \
-    "any-version"
-  $STD apt install -y caddy
-  msg_ok "Installed Caddy"
+  fetch_and_deploy_gh_release "caddy" "caddyserver/caddy" "binary" "latest" "/opt/caddy" "caddy_*_linux_$(arch_resolve).deb"
+  systemctl enable -q --now caddy
 
   prompt="${var_caddy_xcaddy:-}"
   [[ -n "$prompt" ]] || read -r -p "${TAB3}Would you like to install xCaddy Addon? <y/N> " prompt