Headscale: Add headscale-admin UI as option (#6205)

install/headscale-install.sh

@@ -15,6 +15,43 @@ update_os
 
 fetch_and_deploy_gh_release "headscale" "juanfont/headscale" "binary"
 
+read -r -p "${TAB3}Would you like to add headscale-admin UI? <y/N> " prompt
+if [[ ${prompt,,} =~ ^(y|yes)$ ]]; then
+  fetch_and_deploy_gh_release "headscale-admin" "GoodiesHQ/headscale-admin" "prebuild" "latest" "/opt/headscale-admin" "admin.zip"
+  
+  msg_info "Configuring headscale-admin"
+  $STD apt-get install -y caddy
+  $STD caddy stop
+  rm /etc/caddy/Caddyfile
+  cat <<EOF >/etc/caddy/Caddyfile
+:{$PORT:80}
+
+handle_path /admin* {
+        root * /opt/headscale-admin
+        encode gzip zstd
+
+        # Correct MIME types for JS/WASM
+        header {
+                @js_files path *.js
+                @wasm_files path *.wasm
+
+                Content-Type @js_files application/javascript
+                Content-Type @wasm_files application/wasm
+
+                X-Content-Type-Options nosniff
+        }
+
+        # Fallback for SPA routing
+        try_files {path} {path}/ index.html
+        file_server
+}
+
+EOF
+  caddy fmt --overwrite /etc/caddy/Caddyfile
+  systemctl start caddy
+  msg_ok "Configured headscale-admin"
+fi
+
 msg_info "Starting service"
 systemctl enable -q --now headscale
 msg_ok "Service started"