Allow the 'updateStrategy' of the Daemonset to be configured in Helm

This PR enables the 'updateStrategy' of the Daemonset to be configured by Helm parameters.  This has two different parameters, one for Linux and one for Windows, following the existing pattern for these variables.  The default values are the same as the current defaults; RollingUpdate strategy with maxUnavailable set to 1, so behavior will change only if the user specifies a custom value.

Author: chrisamert

manifest_staging/charts/secrets-store-csi-driver/README.md

@@ -42,6 +42,7 @@ The following table lists the configurable parameters of the csi-secrets-store-p
 | `linux.livenessProbe.resources`         | The resource request/limits for the linux liveness-probe container image                                                          | `limits: 100m CPU, 100Mi; requests: 10m CPU, 20Mi`               |
 | `linux.env`                             | Environment variables to be passed for the daemonset on linux nodes                                                               | `[]`                                                             |
 | `linux.priorityClassName`               | Indicates the importance of a Pod relative to other Pods.                                                                         | `""`                                                             |
+| `linux.updateStrategy`                  | Configure a custom update strategy for the daemonset on linux nodes                                                               | `RollingUpdate with 1 maxUnavailable`                            |
 | `windows.image.repository`              | Windows image repository                                                                                                          | `us.gcr.io/k8s-artifacts-prod/csi-secrets-store/driver`          |
 | `windows.image.pullPolicy`              | Windows image pull policy                                                                                                         | `IfNotPresent`                                                   |
 | `windows.image.tag`                     | Windows image tag                                                                                                                 | `v0.0.16`                                                        |
@@ -61,6 +62,7 @@ The following table lists the configurable parameters of the csi-secrets-store-p
 | `windows.livenessProbe.resources`       | The resource request/limits for the windows liveness-probe container image                                                        | `limits: 200m CPU, 200Mi; requests: 10m CPU, 20Mi`               |
 | `windows.env`                           | Environment variables to be passed for the daemonset on windows nodes                                                             | `[]`                                                             |
 | `windows.priorityClassName`             | Indicates the importance of a Pod relative to other Pods.                                                                         | `""`                                                             |
+| `windows.updateStrategy`                | Configure a custom update strategy for the daemonset on windows nodes                                                             | `RollingUpdate with 1 maxUnavailable`                            |
 | `logLevel.debug`                        | Enable debug logging                                                                                                              | true                                                             |
 | `livenessProbe.port`                    | Liveness probe port                                                                                                               | `9808`                                                           |
 | `livenessProbe.logLevel`                | Liveness probe container logging verbosity level                                                                                  | `2`                                                              |

manifest_staging/charts/secrets-store-csi-driver/templates/secrets-store-csi-driver-windows.yaml

@@ -9,6 +9,8 @@ spec:
   selector:
     matchLabels:
       app: {{ template "sscd.name" . }}
+  updateStrategy:
+{{ toYaml .Values.windows.updateStrategy | indent 4 }}
   template:
     metadata:
 {{ include "sscd.labels" . | indent 6 }}

manifest_staging/charts/secrets-store-csi-driver/templates/secrets-store-csi-driver.yaml

@@ -9,6 +9,8 @@ spec:
   selector:
     matchLabels:
       app: {{ template "sscd.name" . }}
+  updateStrategy:
+{{ toYaml .Values.linux.updateStrategy | indent 4 }}
   template:
     metadata:
 {{ include "sscd.labels" . | indent 6 }}

manifest_staging/charts/secrets-store-csi-driver/values.yaml

@@ -42,6 +42,11 @@ linux:
         cpu: 10m
         memory: 20Mi
 
+  updateStrategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+
   kubeletRootDir: /var/lib/kubelet
   nodeSelector: {}
   tolerations: []
@@ -93,6 +98,11 @@ windows:
         cpu: 10m
         memory: 20Mi
 
+  updateStrategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+
   kubeletRootDir: C:\var\lib\kubelet
   nodeSelector: {}
   tolerations: []