Add auto-update system for DashCaddy instances

- self-updater.js: polls for new versions, downloads/verifies tarballs,
  triggers host-side rebuild via systemd path unit
- dashcaddy-update.sh + systemd units: host-side container rebuild with
  automatic rollback on health check failure
- 7 new /api/v1/system/* endpoints for version info, update check/apply,
  rollback, and update history
- Frontend: DashCaddy tab in Updates modal with version display,
  changelog, update button, rollback, and notification dot
- install.sh: updater service installation, volume mounts, env vars
- build-release.sh + webhook-handler.js: release server pipeline
  (Gitea webhook → build tarball → deploy to get.dashcaddy.net)
- Dockerfile: DASHCADDY_COMMIT build arg → VERSION file
- Version bump to 1.1.0

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dashcaddy-installer/install.sh

@@ -17,7 +17,7 @@
 set -euo pipefail
 
 # ---- Constants -------------------------------------------------------------
-readonly DASHCADDY_VERSION="1.0.0"
+readonly DASHCADDY_VERSION="1.1.0"
 readonly DASHCADDY_DOWNLOAD="https://get.dashcaddy.net/release/latest.tar.gz"
 readonly DASHCADDY_REPO=""  # Set to a git URL to clone instead of downloading
 readonly INSTALL_DIR="/etc/dashcaddy"
@@ -388,6 +388,7 @@ EOF
 
 create_directories() {
   mkdir -p "$INSTALL_DIR" "$DOCKER_DATA" "$SITES_DIR" "$API_DIR" "$DASHBOARD_DIR" "${DASHBOARD_DIR}/assets"
+  mkdir -p /opt/dashcaddy/updates /opt/dashcaddy/scripts
   ok "Directories created"
 }
 
@@ -444,6 +445,19 @@ fetch_source() {
   done
   ok "Dashboard files deployed"
 
+  # Deploy updater scripts
+  local scripts_src=""
+  for try in "${api_src}/scripts" "${tmp_src}/scripts"; do
+    [[ -d "$try" ]] && scripts_src="$try" && break
+  done
+  if [[ -n "$scripts_src" ]]; then
+    cp -f "${scripts_src}/dashcaddy-update.sh" /opt/dashcaddy/scripts/ 2>/dev/null || true
+    cp -f "${scripts_src}/dashcaddy-updater.path" /opt/dashcaddy/scripts/ 2>/dev/null || true
+    cp -f "${scripts_src}/dashcaddy-updater.service" /opt/dashcaddy/scripts/ 2>/dev/null || true
+    chmod +x /opt/dashcaddy/scripts/dashcaddy-update.sh 2>/dev/null || true
+    ok "Updater scripts deployed"
+  fi
+
   # Cleanup
   [[ -z "$SOURCE_PATH" ]] && rm -rf "$tmp_src"
 }
@@ -630,6 +644,8 @@ services:
       - ${INSTALL_DIR}/totp-config.json:/app/totp-config.json:rw
       - ${INSTALL_DIR}/notifications.json:/app/notifications.json:rw
       - ${DASHBOARD_DIR}/assets:/app/assets:rw
+      - ${DASHBOARD_DIR}:/app/dashboard:rw
+      - /opt/dashcaddy/updates:/app/updates:rw
       - /var/run/docker.sock:/var/run/docker.sock
     environment:
       - CADDYFILE_PATH=/caddyfile
@@ -641,6 +657,12 @@ services:
       - DNS_CREDENTIALS_FILE=/app/dns-credentials.json
       - HOST_LAN_IP=${LAN_IP}
       - NODE_ENV=production
+      - DASHCADDY_UPDATE_ENABLED=true
+      - DASHCADDY_UPDATE_URL=https://get.dashcaddy.net/release
+      - DASHCADDY_MIRROR_URL=https://get2.dashcaddy.net/release
+      - DASHCADDY_UPDATES_DIR=/app/updates
+      - DASHCADDY_API_SOURCE_DIR=${API_DIR}
+      - DASHCADDY_FRONTEND_DIR=/app/dashboard
     extra_hosts:
       - "host.docker.internal:host-gateway"
     restart: unless-stopped
@@ -654,6 +676,57 @@ DCEOF
   ok "docker-compose.yml generated"
 }
 
+# ============================================================================
+# Auto-Updater Service
+# ============================================================================
+
+install_updater_service() {
+  local scripts_dir="/opt/dashcaddy/scripts"
+
+  if [[ ! -f "${scripts_dir}/dashcaddy-update.sh" ]]; then
+    warn "Updater script not found — skipping auto-update service"
+    return
+  fi
+
+  # Install systemd units
+  if [[ -f "${scripts_dir}/dashcaddy-updater.path" ]]; then
+    cp -f "${scripts_dir}/dashcaddy-updater.path" /etc/systemd/system/
+  else
+    cat > /etc/systemd/system/dashcaddy-updater.path <<'PATHEOF'
+[Unit]
+Description=Watch for DashCaddy update trigger
+[Path]
+PathChanged=/opt/dashcaddy/updates/trigger.json
+MakeDirectory=yes
+[Install]
+WantedBy=multi-user.target
+PATHEOF
+  fi
+
+  if [[ -f "${scripts_dir}/dashcaddy-updater.service" ]]; then
+    cp -f "${scripts_dir}/dashcaddy-updater.service" /etc/systemd/system/
+  else
+    cat > /etc/systemd/system/dashcaddy-updater.service <<'SVCEOF'
+[Unit]
+Description=DashCaddy auto-update handler
+After=docker.service
+Requires=docker.service
+[Service]
+Type=oneshot
+ExecStart=/opt/dashcaddy/scripts/dashcaddy-update.sh
+TimeoutStartSec=300
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=dashcaddy-update
+SVCEOF
+  fi
+
+  systemctl daemon-reload
+  systemctl enable dashcaddy-updater.path >/dev/null 2>&1
+  systemctl start dashcaddy-updater.path >/dev/null 2>&1
+  ok "Auto-updater service installed"
+}
+
 # ============================================================================
 # Build & Launch
 # ============================================================================
@@ -759,6 +832,13 @@ do_uninstall() {
 
   docker rm -f "$CONTAINER_NAME" 2>/dev/null && ok "Container removed" || true
 
+  # Stop and remove updater service
+  systemctl stop dashcaddy-updater.path 2>/dev/null || true
+  systemctl disable dashcaddy-updater.path 2>/dev/null || true
+  rm -f /etc/systemd/system/dashcaddy-updater.path /etc/systemd/system/dashcaddy-updater.service
+  systemctl daemon-reload 2>/dev/null || true
+  rm -rf /opt/dashcaddy && ok "Updater service removed" || true
+
   if [[ -L /etc/caddy/Caddyfile ]] && readlink /etc/caddy/Caddyfile | grep -q dashcaddy; then
     rm -f /etc/caddy/Caddyfile
     [[ -f /etc/caddy/Caddyfile.original ]] && mv /etc/caddy/Caddyfile.original /etc/caddy/Caddyfile
@@ -949,6 +1029,7 @@ main() {
   # ---- Step 6: Build & start ----
   step "Building & starting services"
   build_and_start
+  install_updater_service
 
   # ---- Step 7: Start Caddy ----
   step "Starting web server"