chore: switch storagesvc to S3 backend (ngcloud msk-1)

- helm/fission-values.yaml: storageType=s3, bucket=sless-functions, endPoint=https://s3.msk-1.ngcloud.ru
- helm/fission-values-pv.yaml: сохранён PV конфиг для быстрого возврата
- helm/fission-s3-secret.yaml: credentials (в .gitignore, не в репо)
- .gitignore: добавлен helm/fission-s3-secret.yaml

Возврат на PV: kubectl delete deploy executor router storagesvc -n fission
  helm upgrade fission ... -f helm/fission-values-pv.yaml --no-hooks

helm/fission-values-pv.yaml

@@ -0,0 +1,30 @@
+# Fission helm values — PV (vcd-disk-ext4) backend
+# Применять: helm upgrade fission fission-charts/fission-all --version 1.22.1 \
+#              -n fission -f helm/fission-values-pv.yaml
+#
+# Секретов нет — local storage не требует credentials.
+# ПЕРЕД upgrade: kubectl delete deploy executor router -n fission
+
+authentication:
+  enabled: true
+
+defaultNamespace: fission-functions
+
+image: naeel/fission-bundle
+imageTag: v1.23.0
+fetcher:
+  image: naeel/fetcher
+  imageTag: v1.23.0
+
+persistence:
+  enabled: true
+  storageType: local
+  storageClass: vcd-disk-ext4
+  size: 2Gi
+  accessMode: ReadWriteOnce
+
+repository: ""
+routerServiceType: ClusterIP
+serviceType: ClusterIP
+
+analytics: false