docs: add update script and improve manual install instructions

scripts/update-filerise.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+# Update FileRise in /var/www from a GitHub release ZIP
+set -Eeuo pipefail
+
+# Usage: ./update-filerise.sh v2.5.2
+VERSION="${1:-v2.5.2}"
+ASSET="FileRise-${VERSION}.zip"
+
+WEBROOT="/var/www"
+TMP="/tmp/filerise-update"
+
+echo "Updating FileRise in ${WEBROOT} to ${VERSION}"
+
+# 0) Backup config + data
+stamp="$(date +%F-%H%M)"
+mkdir -p /root/backups
+tar -C "$WEBROOT" -czf "/root/backups/filerise-$stamp.tgz"   config   uploads   users   metadata || true
+echo "Backup saved to /root/backups/filerise-$stamp.tgz"
+
+# 1) Fetch the release zip
+rm -rf "$TMP"
+mkdir -p "$TMP"
+curl -fsSL "https://github.com/error311/FileRise/releases/download/${VERSION}/${ASSET}" -o "$TMP/$ASSET"
+
+# 2) Unzip to a staging dir
+unzip -q "$TMP/$ASSET" -d "$TMP"
+STAGE_DIR="$(find "$TMP" -maxdepth 1 -type d -name 'FileRise*' ! -path "$TMP" | head -n1 || true)"
+[ -n "${STAGE_DIR:-}" ] || STAGE_DIR="$TMP"
+
+# 3) Sync code into /var/www
+#    - keep existing config/config.php
+#    - keep data dirs (uploads/users/metadata)
+#    - don't sync CI/docker stuff
+rsync -a --delete   --exclude='config/config.php'   --exclude='uploads/***'   --exclude='users/***'   --exclude='metadata/***'   --exclude='.github/***'   --exclude='docker-compose.yml'   "$STAGE_DIR"/ "$WEBROOT"/
+
+# 4) Ownership (Ubuntu/Debian w/ Apache)
+chown -R www-data:www-data "$WEBROOT"
+
+# 5) Composer (usually not needed; release ZIP includes vendor/)
+if [ ! -d "$WEBROOT/vendor" ] && command -v composer >/dev/null 2>&1; then
+  (cd "$WEBROOT" && composer install --no-dev --optimize-autoloader)
+fi
+
+echo "FileRise updated to ${VERSION} in ${WEBROOT}"