Refactor:Standardize image conf and add private registry support (#9496)

- Unified configuration format: All services now use the same image
configuration structure for consistency.

- Private registry support: Added imagePullSecrets to enable pulling
images from private registries.

- Per-service flexibility: Each service can override image-related
parameters independently.

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

helm/values.yaml

@@ -1,4 +1,8 @@
 # Based on docker compose .env file
+
+# Global image pull secrets configuration
+imagePullSecrets: []
+
 env:
   # The type of doc engine to use.
   # Available options:
@@ -32,31 +36,6 @@ env:
   # The password for Redis
   REDIS_PASSWORD: infini_rag_flow_helm
 
-  # The RAGFlow Docker image to download.
-  # Defaults to the v0.20.1-slim edition, which is the RAGFlow Docker image without embedding models.
-  RAGFLOW_IMAGE: infiniflow/ragflow:v0.20.1-slim
-  #
-  # To download the RAGFlow Docker image with embedding models, uncomment the following line instead:
-  # RAGFLOW_IMAGE: infiniflow/ragflow:v0.20.1
-  #
-  # The Docker image of the v0.20.1 edition includes:
-  # - Built-in embedding models:
-  #   - BAAI/bge-large-zh-v1.5
-  #   - BAAI/bge-reranker-v2-m3
-  #   - maidalun1020/bce-embedding-base_v1
-  #   - maidalun1020/bce-reranker-base_v1
-  # - Embedding models that will be downloaded once you select them in the RAGFlow UI:
-  #   - BAAI/bge-base-en-v1.5
-  #   - BAAI/bge-large-en-v1.5
-  #   - BAAI/bge-small-en-v1.5
-  #   - BAAI/bge-small-zh-v1.5
-  #   - jinaai/jina-embeddings-v2-base-en
-  #   - jinaai/jina-embeddings-v2-small-en
-  #   - nomic-ai/nomic-embed-text-v1.5
-  #   - sentence-transformers/all-MiniLM-L6-v2
-  #
-  #
-
   # The local time zone.
   TIMEZONE: "Asia/Shanghai"
 
@@ -75,7 +54,11 @@ env:
   EMBEDDING_BATCH_SIZE: 16
 
 ragflow:
-
+  image:
+    repository: infiniflow/ragflow
+    tag: v0.20.1-slim
+    pullPolicy: IfNotPresent
+    pullSecrets: []
   # Optional service configuration overrides
   # to be written to local.service_conf.yaml
   # inside the RAGFlow container
@@ -114,6 +97,8 @@ infinity:
   image:
     repository: infiniflow/infinity
     tag: v0.6.0-dev5
+    pullPolicy: IfNotPresent
+    pullSecrets: []
   storage:
     className:
     capacity: 5Gi
@@ -124,6 +109,20 @@ infinity:
     type: ClusterIP
 
 elasticsearch:
+  image:
+    repository: elasticsearch
+    tag: "8.11.3"
+    pullPolicy: IfNotPresent
+    pullSecrets: []
+  initContainers:
+    alpine:
+      repository: alpine
+      tag: latest
+      pullPolicy: IfNotPresent
+    busybox:
+      repository: busybox
+      tag: latest
+      pullPolicy: IfNotPresent
   storage:
     className:
     capacity: 20Gi
@@ -140,6 +139,17 @@ opensearch:
   image:
     repository: opensearchproject/opensearch
     tag: 2.19.1
+    pullPolicy: IfNotPresent
+    pullSecrets: []
+  initContainers:
+    alpine:
+      repository: alpine
+      tag: latest
+      pullPolicy: IfNotPresent
+    busybox:
+      repository: busybox
+      tag: latest
+      pullPolicy: IfNotPresent
   storage:
     className:
     capacity: 20Gi
@@ -156,6 +166,8 @@ minio:
   image:
     repository: quay.io/minio/minio
     tag: RELEASE.2023-12-20T01-00-02Z
+    pullPolicy: IfNotPresent
+    pullSecrets: []
   storage:
     className:
     capacity: 5Gi
@@ -169,6 +181,8 @@ mysql:
   image:
     repository: mysql
     tag: 8.0.39
+    pullPolicy: IfNotPresent
+    pullSecrets: []
   storage:
     className:
     capacity: 5Gi
@@ -182,6 +196,8 @@ redis:
   image:
     repository: valkey/valkey
     tag: 8
+    pullPolicy: IfNotPresent
+    pullSecrets: []
   storage:
     className:
     capacity: 5Gi