docs: define production sync deployment

Fixes #15

deployments/systemd/bluearchive-toolkit-official-sync.service

@@ -0,0 +1,39 @@
+[Unit]
+Description=BlueArchiveToolkit official resource sync
+Documentation=https://github.com/Yuyi-Oak/BlueArchiveToolkit
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+Type=simple
+User=bat
+Group=bat
+WorkingDirectory=/var/lib/bluearchive-toolkit
+Environment=BAT_OUTPUT_ROOT=/var/lib/bluearchive-toolkit/official
+Environment=BAT_INTERVAL=1h
+Environment=BAT_ERROR_RETRY=60s
+EnvironmentFile=-/etc/bluearchive-toolkit/official-sync.env
+ExecStart=/opt/bluearchive-toolkit/bin/bat --auto-discover --output ${BAT_OUTPUT_ROOT} --watch --interval ${BAT_INTERVAL} --error-retry ${BAT_ERROR_RETRY} --no-banner
+Restart=on-failure
+RestartSec=30
+TimeoutStopSec=60
+KillSignal=SIGTERM
+StandardOutput=journal
+StandardError=journal
+StateDirectory=bluearchive-toolkit
+StateDirectoryMode=0750
+RuntimeDirectory=bluearchive-toolkit
+RuntimeDirectoryMode=0750
+LogsDirectory=bluearchive-toolkit
+LogsDirectoryMode=0750
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectHome=true
+ProtectSystem=strict
+ReadWritePaths=/var/lib/bluearchive-toolkit /run/bluearchive-toolkit /var/log/bluearchive-toolkit
+RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
+LockPersonality=true
+MemoryDenyWriteExecute=true
+
+[Install]
+WantedBy=multi-user.target