Add systemd service config files

Author: FastAlien

config/auth-monitor

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+# The maximum number of failed authentication attempts before the system shutdown.
+# Default: 5
+MAX_FAILED_ATTEMPTS=5
+
+# The authentication failure counter will reset after the specified seconds.
+# Default: 1800
+RESET_AFTER_SECONDS=1800
+
+# The path to the file were authentication logs are stored.
+# Default: /var/log/auth.log
+LOG_FILE=/var/log/auth.log

etc/default/auth-monitor

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+auth-monitor ALL=NOPASSWD: /usr/bin/systemctl poweroff

etc/sudoers.d/auth-monitor

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+[Unit]
+Description=AuthMonitor
+
+[Service]
+EnvironmentFile=/etc/default/auth-monitor
+ExecStart=/usr/local/bin/auth-monitor ${LOG_FILE} --max-failed-attempts=${MAX_FAILED_ATTEMPTS} --reset-after-seconds=${RESET_AFTER_SECONDS}
+Restart=always
+User=auth-monitor
+
+[Install]
+WantedBy=multi-user.target