docs(argo-workflows): Add MySQL persistence support explicitly on README (#2448)

charts/argo-workflows/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: v3.5.4
 name: argo-workflows
 description: A Helm chart for Argo Workflows
 type: application
-version: 0.40.8
+version: 0.40.9
 icon: https://argoproj.github.io/argo-workflows/assets/logo.png
 home: https://github.com/argoproj/argo-helm
 sources:
@@ -16,5 +16,5 @@ annotations:
     fingerprint: 2B8F22F57260EFA67BE1C5824B11F800CD9D2252
     url: https://argoproj.github.io/argo-helm/pgp_keys.asc
   artifacthub.io/changes: |
-    - kind: fixed
-      description: Remove trailing whitespace from `.resourceRateLimit` when value is set and `.sso.redirectUrl` when value is an empty string.
+    - kind: added
+      description: Add MySQL persistence support explicitly on README

charts/argo-workflows/README.md

@@ -186,7 +186,7 @@ Fields to note:
 | controller.nodeSelector | object | `{"kubernetes.io/os":"linux"}` | [Node selector] |
 | controller.parallelism | string | `nil` | parallelism dictates how many workflows can be running at the same time |
 | controller.pdb.enabled | bool | `false` | Configure [Pod Disruption Budget] for the controller pods |
-| controller.persistence | object | `{}` | enable persistence using postgres |
+| controller.persistence | object | `{}` | enable Workflow Archive to store the status of workflows. Postgres and MySQL (>= 5.7.8) are available. |
 | controller.podAnnotations | object | `{}` | podAnnotations is an optional map of annotations to be applied to the controller Pods |
 | controller.podCleanupWorkers | string | `nil` | Number of pod cleanup workers |
 | controller.podGCDeleteDelayDuration | string | `5s` (Argo Workflows default) | The duration in seconds before the pods in the GC queue get deleted. A zero value indicates that the pods will be deleted immediately. |

charts/argo-workflows/values.yaml

@@ -146,7 +146,8 @@ controller:
     capabilities:
       drop:
         - ALL
-  # -- enable persistence using postgres
+  # -- enable Workflow Archive to store the status of workflows. Postgres and MySQL (>= 5.7.8) are available.
+  ## Ref: https://argo-workflows.readthedocs.io/en/latest/workflow-archive/
   persistence: {}
   # connectionPool:
   #   maxIdleConns: 100
@@ -171,6 +172,17 @@ controller:
   #   # sslMode must be one of: disable, require, verify-ca, verify-full
   #   # you can find more information about those ssl options here: https://godoc.org/github.com/lib/pq
   #   sslMode: require
+  # mysql:
+  #   host: localhost
+  #   port: 3306
+  #   database: argo
+  #   tableName: argo_workflows
+  #   userNameSecret:
+  #     name: argo-mysql-config
+  #     key: username
+  #   passwordSecret:
+  #     name: argo-mysql-config
+  #     key: password
 
   # -- Default values that will apply to all Workflows from this controller, unless overridden on the Workflow-level.
   # Only valid for 2.7+