fix(deploy): git pull 后备份脚本不依赖可执行位

db_backup/backup_mysql 改为检测文件存在并用 bash 调用；install_ops_cron 一并 chmod 备份脚本。

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/db_backup.sh

@@ -12,10 +12,11 @@ BACKUP_DIR="${NEXUS_BACKUP_DIR:-/var/backups/nexus}"
 RETENTION_DAYS="${NEXUS_BACKUP_RETENTION_DAYS:-30}"
 DUMP_SH="${SCRIPT_DIR}/mysql_dump_to_file.sh"
 
-if [[ ! -x "$DUMP_SH" ]]; then
+if [[ ! -f "$DUMP_SH" ]]; then
     echo "[$(date)] ERROR: missing $DUMP_SH"
     exit 1
 fi
+chmod +x "$DUMP_SH" 2>/dev/null || true
 
 mkdir -p "$BACKUP_DIR"
 TIMESTAMP="$(date +%Y%m%d_%H%M%S)"

deploy/install_ops_cron.sh

@@ -49,7 +49,11 @@ ensure_crontab() {
 
 ensure_crontab
 
-for f in "${DEPLOY_DIR}/health_monitor.sh" "${DEPLOY_DIR}/db_backup.sh"; do
+for f in \
+    "${DEPLOY_DIR}/health_monitor.sh" \
+    "${DEPLOY_DIR}/db_backup.sh" \
+    "${DEPLOY_DIR}/mysql_dump_to_file.sh" \
+    ; do
     if [[ ! -f "$f" ]]; then
         error "缺少脚本: $f"
         exit 1

deploy/nexus-1panel.sh

@@ -1057,7 +1057,7 @@ backup_mysql() {
         return 0
     fi
     dump_sh="${root}/deploy/mysql_dump_to_file.sh"
-    if [[ ! -x "$dump_sh" ]]; then
+    if [[ ! -f "$dump_sh" ]]; then
         warn "缺少 $dump_sh，跳过 MySQL 备份"
         return 0
     fi