Create uninstall_service_systemd.sh

This has been requested at https://github.com/Jackett/Jackett/issues/15102 and it seems to be working for me.

uninstall_service_systemd.sh

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+#!/bin/bash
+
+# Define the directory where Jackett was installed
+INSTALL_DIR1="/opt/Jackett"
+INSTALL_DIR2="/opt/jackett"
+
+# Define the systemd service file for Jackett
+JACKETT_SERVICE_PATH="/etc/systemd/system/jackett.service"
+
+# Ensure the script is running with superuser privileges
+if [ "$(id -u)" -ne 0 ]; then
+  echo "This script must be run as root. Try using 'sudo bash $0'."
+  exit 1
+fi
+
+echo "Starting Jackett uninstallation..."
+
+# Stop the Jackett service
+echo "Stopping the Jackett service..."
+if systemctl stop jackett.service; then
+  echo "Jackett service stopped successfully."
+else
+  echo "Failed to stop the Jackett service. It may not have been running."
+fi
+
+# Disable the Jackett service
+echo "Disabling the Jackett service..."
+if systemctl disable jackett.service; then
+  echo "Jackett service disabled successfully."
+else
+  echo "Failed to disable the Jackett service."
+fi
+
+# Remove the systemd service file
+echo "Removing the systemd service file..."
+rm -vf "$JACKETT_SERVICE_PATH"
+
+# Reload systemd to remove traces of the Jackett service
+echo "Reloading systemd daemon..."
+systemctl daemon-reload
+
+# Remove the Jackett installation directory
+echo "Removing Jackett installation directory..."
+rm -rf "$INSTALL_DIR1"
+rm -rf "$INSTALL_DIR2"
+
+echo "Jackett uninstallation finished."