deploy: make Phoenix redeploys archive-safe

scripts/deployment/systemd/currencicombo-webapp.service

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+[Unit]
+Description=CurrenciCombo webapp (Vite SPA served by nginx)
+Documentation=https://gitea.d-bis.org/d-bis/CurrenciCombo
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=currencicombo
+Group=currencicombo
+RuntimeDirectory=currencicombo-webapp
+RuntimeDirectoryMode=0755
+ExecStart=/usr/sbin/nginx -c /etc/currencicombo/webapp-nginx.conf -g 'daemon off; pid /run/currencicombo-webapp/nginx.pid;'
+ExecReload=/usr/sbin/nginx -c /etc/currencicombo/webapp-nginx.conf -s reload
+Restart=on-failure
+RestartSec=5
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=currencicombo-webapp
+
+# Hardening
+NoNewPrivileges=yes
+PrivateTmp=yes
+ProtectSystem=strict
+ProtectHome=yes
+ReadWritePaths=/var/log/currencicombo /run/currencicombo-webapp
+ProtectKernelTunables=yes
+ProtectKernelModules=yes
+ProtectControlGroups=yes
+RestrictSUIDSGID=yes
+LockPersonality=yes
+
+[Install]
+WantedBy=multi-user.target