diff --git a/install-gitea-runner.sh b/install-gitea-runner.sh
new file mode 100644
index 0000000..c1ec979
--- /dev/null
+++ b/install-gitea-runner.sh
@@ -0,0 +1,180 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+RUNNER_VERSION="${RUNNER_VERSION:-1.0.8}"
+RUNNER_USER="${RUNNER_USER:-act_runner}"
+RUNNER_HOME="${RUNNER_HOME:-/var/lib/act_runner}"
+RUNNER_CONFIG_DIR="${RUNNER_CONFIG_DIR:-/etc/act_runner}"
+RUNNER_CONFIG_FILE="${RUNNER_CONFIG_FILE:-$RUNNER_CONFIG_DIR/config.yaml}"
+RUNNER_BINARY_PATH="${RUNNER_BINARY_PATH:-/usr/local/bin/act_runner}"
+RUNNER_NAME="${RUNNER_NAME:-$(hostname)}"
+RUNNER_LABELS="${RUNNER_LABELS:-linux_amd64:host,ubuntu-latest:docker://node:20-bookworm}"
+GITEA_INSTANCE_URL="${GITEA_INSTANCE_URL:-}"
+GITEA_RUNNER_TOKEN="${GITEA_RUNNER_TOKEN:-}"
+REGISTER_RUNNER="${REGISTER_RUNNER:-true}"
+
+log() {
+  printf '[RUNNER] %s\n' "$1"
+}
+
+require_root() {
+  if [ "${EUID}" -ne 0 ]; then
+    echo "Dieses Script muss als root laufen." >&2
+    exit 1
+  fi
+}
+
+install_packages() {
+  log "Installiere Systempakete"
+  apt update
+  apt install -y docker.io curl wget unzip git ca-certificates python3
+  systemctl enable --now docker
+}
+
+create_runner_user() {
+  log "Erstelle Runner-User und Verzeichnisse"
+
+  if ! id -u "$RUNNER_USER" >/dev/null 2>&1; then
+    useradd --system --create-home --shell /bin/bash "$RUNNER_USER"
+  fi
+
+  usermod -aG docker "$RUNNER_USER"
+  mkdir -p "$RUNNER_HOME" "$RUNNER_CONFIG_DIR"
+  chown -R "$RUNNER_USER:$RUNNER_USER" "$RUNNER_HOME" "$RUNNER_CONFIG_DIR"
+}
+
+install_runner_binary() {
+  local tmp_dir archive_name download_url
+
+  log "Installiere act_runner ${RUNNER_VERSION}"
+  tmp_dir="$(mktemp -d)"
+  archive_name="act_runner-${RUNNER_VERSION}-linux-amd64"
+  download_url="https://dl.gitea.com/act_runner/${RUNNER_VERSION}/${archive_name}"
+
+  curl -fsSL "$download_url" -o "${tmp_dir}/act_runner"
+  install -m 0755 "${tmp_dir}/act_runner" "$RUNNER_BINARY_PATH"
+  rm -rf "$tmp_dir"
+
+  "$RUNNER_BINARY_PATH" --version
+}
+
+generate_config() {
+  log "Erzeuge Runner-Konfiguration"
+  sudo -u "$RUNNER_USER" -H bash -lc "\"$RUNNER_BINARY_PATH\" generate-config > \"$RUNNER_CONFIG_FILE\""
+
+  python3 - "$RUNNER_CONFIG_FILE" "$RUNNER_LABELS" <<'PY'
+from pathlib import Path
+import sys
+
+config_path = Path(sys.argv[1])
+labels = [label.strip() for label in sys.argv[2].split(",") if label.strip()]
+content = config_path.read_text(encoding="utf-8")
+lines = content.splitlines()
+out = []
+in_runner = False
+labels_written = False
+skip_existing_labels = False
+
+for idx, line in enumerate(lines):
+    stripped = line.strip()
+    if stripped == "runner:":
+        in_runner = True
+        out.append(line)
+        continue
+
+    if in_runner and line and not line.startswith("  "):
+        if not labels_written:
+            out.append("  labels:")
+            for label in labels:
+                out.append(f"    - \"{label}\"")
+            labels_written = True
+        in_runner = False
+
+    if in_runner and stripped.startswith("labels:"):
+        skip_existing_labels = True
+        continue
+
+    if skip_existing_labels:
+        if line.startswith("    - ") or stripped == "":
+            continue
+        skip_existing_labels = False
+
+    out.append(line)
+
+if in_runner and not labels_written:
+    out.append("  labels:")
+    for label in labels:
+        out.append(f"    - \"{label}\"")
+
+config_path.write_text("\n".join(out) + "\n", encoding="utf-8")
+PY
+
+  chown "$RUNNER_USER:$RUNNER_USER" "$RUNNER_CONFIG_FILE"
+}
+
+register_runner() {
+  if [ "$REGISTER_RUNNER" != "true" ]; then
+    log "Runner-Registrierung übersprungen"
+    return
+  fi
+
+  if [ -z "$GITEA_INSTANCE_URL" ] || [ -z "$GITEA_RUNNER_TOKEN" ]; then
+    echo "Für die Registrierung werden GITEA_INSTANCE_URL und GITEA_RUNNER_TOKEN benötigt." >&2
+    exit 1
+  fi
+
+  log "Registriere Runner bei ${GITEA_INSTANCE_URL}"
+  sudo -u "$RUNNER_USER" -H bash -lc "cd \"$RUNNER_HOME\" && rm -f .runner && \"$RUNNER_BINARY_PATH\" register --no-interactive --instance \"$GITEA_INSTANCE_URL\" --token \"$GITEA_RUNNER_TOKEN\" --name \"$RUNNER_NAME\" --labels \"$RUNNER_LABELS\""
+}
+
+install_service() {
+  log "Installiere systemd-Service"
+  cat >/etc/systemd/system/act_runner.service <<EOF
+[Unit]
+Description=Gitea Actions runner
+Documentation=https://docs.gitea.com/usage/actions/act-runner
+After=docker.service
+Requires=docker.service
+
+[Service]
+User=${RUNNER_USER}
+WorkingDirectory=${RUNNER_HOME}
+ExecStart=${RUNNER_BINARY_PATH} daemon --config ${RUNNER_CONFIG_FILE}
+Restart=always
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+  systemctl daemon-reload
+  systemctl enable --now act_runner
+}
+
+print_summary() {
+  log "Fertig"
+  echo
+  echo "Service-Status:"
+  systemctl --no-pager --full status act_runner || true
+  echo
+  echo "Wichtige Pfade:"
+  echo "  Binary:  ${RUNNER_BINARY_PATH}"
+  echo "  Config:  ${RUNNER_CONFIG_FILE}"
+  echo "  Home:    ${RUNNER_HOME}"
+  echo
+  echo "Beispiel mit direkter Registrierung:"
+  echo "  sudo GITEA_INSTANCE_URL=https://gitea.example.tld GITEA_RUNNER_TOKEN=TOKEN ./install-gitea-runner.sh"
+}
+
+main() {
+  require_root
+  install_packages
+  create_runner_user
+  install_runner_binary
+  generate_config
+  register_runner
+  install_service
+  print_summary
+}
+
+main "$@"