v0.13.0 web and terminal client enhance, replay api, linux server deploy, doc and dependency update

deploy/postgresql/chess-backup.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+# Nightly logical backup of the chess database, run as the postgres account.
+# Installed as /usr/local/sbin/chess-backup by deploy/freebsd/setup-jail.sh
+# (scheduled through /usr/local/etc/cron.d/chess-backup) and by
+# deploy/linux/setup.sh (scheduled by the chess-backup.timer systemd unit).
+#
+#   CHESS_BACKUP_DIR   destination (default: backups/ in the postgres home,
+#                      e.g. /var/db/postgres/backups on FreeBSD)
+#   CHESS_BACKUP_KEEP  days of dumps to keep (default: 14)
+#
+# Restore into a freshly provisioned database as the postgres account:
+#   pg_restore --no-owner --role=chess -d chess <dump>
+# (use --role=chess_owner for the split-privilege setup).
+set -eu
+PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
+
+dir=${CHESS_BACKUP_DIR:-${HOME:?}/backups}
+keep=${CHESS_BACKUP_KEEP:-14}
+umask 077
+mkdir -p "$dir"
+
+target="$dir/chess-$(date -u +%Y%m%dT%H%M%SZ).dump"
+if ! pg_dump --format=custom --dbname=chess --file="$target.partial"; then
+	rm -f "$target.partial"
+	exit 1
+fi
+mv "$target.partial" "$target"
+find "$dir" -name 'chess-*.dump' -type f -mtime "+$keep" -delete