fix: Drop hardcoded backup secret name

Author: adskyiproger

charts/dependencies/templates/elasticsearch.yaml

@@ -170,12 +170,12 @@ spec:
             - name: BACKUP_USER
               valueFrom:
                 secretKeyRef:
-                  name: backup-ssh-key
+                  name: {{ .Values.backup.backup_server_secret }}
                   key: user
             - name: BACKUP_HOST
               valueFrom:
                 secretKeyRef:
-                  name: backup-ssh-key
+                  name: {{ .Values.backup.backup_server_secret }}
                   key: host
             - name: BACKUP_REMOTE_DIR
               value: "{{ .Values.elasticsearch.backup_server_dir | default .Values.backup.backup_server_dir }}"