add reset_then_reuse_values support to helm module (#802)

SUMMARY
Starting with version 3.14.0, Helm supports --reset-then-reuse-values. As discussed on the original PR. This greatly improves on --reuse-values as it allows to avoid templates errors when new features are added to an upgraded chart.
Closes #803
ISSUE TYPE

Feature Pull Request

COMPONENT NAME
helm
ADDITIONAL INFORMATION
This PR is greatly 'inspired' by #575 and because I wasn't sure how I could provide additional tests for it, I actually copied those build previously for --reuse-values (as it is an improvement on this feature.

Reviewed-by: Bikouo Aubin
Reviewed-by: Yuriy Novostavskiy
Reviewed-by: b0z02003
Reviewed-by: Bianca Henderson <beeankha@gmail.com>

tests/integration/targets/helm/defaults/main.yml

@@ -26,3 +26,4 @@ test_namespace:
   - "helm-from-url"
   - "helm-reuse-values"
   - "helm-chart-with-space-into-name"
+  - "helm-reset-then-reuse-values"

tests/integration/targets/helm/tasks/main.yml

@@ -4,4 +4,4 @@
   loop_control:
     loop_var: helm_version
   with_items:
-    - "v3.8.0"
+    - "v3.16.0"

tests/integration/targets/helm/tasks/run_test.yml

@@ -28,6 +28,9 @@
 - name: test helm upgrade with reuse_values
   include_tasks: test_helm_reuse_values.yml
 
+- name: test helm upgrade with reset_then_reuse_values
+  include_tasks: test_helm_reset_then_reuse_values.yml
+
 - name: test helm dependency update
   include_tasks: test_up_dep.yml
 

tests/integration/targets/helm/tasks/test_helm_reset_then_reuse_values.yml

@@ -0,0 +1,75 @@
+---
+- name: Test helm reset_then_reuse_values
+  vars:
+    helm_namespace: "{{ test_namespace[11] }}"
+    chart_release_values:
+      replica:
+        replicaCount: 3
+      master:
+        count: 1
+        kind: Deployment
+    chart_reset_then_reuse_values:
+      replica:
+        replicaCount: 1
+      master:
+        count: 3
+  block:
+    - name: Initial chart installation
+      helm:
+        binary_path: "{{ helm_binary }}"
+        chart_ref: oci://registry-1.docker.io/bitnamicharts/redis
+        release_name: test-redis
+        release_namespace: "{{ helm_namespace }}"
+        create_namespace: true
+        release_values: "{{ chart_release_values }}"
+      register: install
+
+    - name: Get value set as string
+      helm_info:
+        binary_path: "{{ helm_binary }}"
+        release_name: test-redis
+        release_namespace: "{{ helm_namespace }}"
+      register: release_value
+
+    - name: Validate that chart values are as expected
+      assert:
+        that:
+          - install is changed
+          - '"--reset-then-reuse-values" not in install.command'
+          - release_value["status"]["values"] == chart_release_values
+
+    - name: Upgrade chart using reset_then_reuse_values=true
+      helm:
+        binary_path: "{{ helm_binary }}"
+        chart_ref: oci://registry-1.docker.io/bitnamicharts/redis
+        release_name: test-redis
+        release_namespace: "{{ helm_namespace }}"
+        reuse_values: false
+        reset_values: false
+        reset_then_reuse_values: true
+        release_values: "{{ chart_reset_then_reuse_values }}"
+      register: upgrade
+
+    - name: Get value set as string
+      helm_info:
+        binary_path: "{{ helm_binary }}"
+        release_name: test-redis
+        release_namespace: "{{ helm_namespace }}"
+      register: release_value
+
+    - name: Validate that chart values are as expected
+      assert:
+        that:
+          - upgrade is changed
+          - '"--reset-then-reuse-values" in upgrade.command'
+          - '"--reuse-values " not in upgrade.command'
+          - '"--reset-values" not in upgrade.command'
+          - release_value["status"]["values"] == chart_release_values | combine(chart_reset_then_reuse_values, recursive=true)
+
+  always:
+    - name: Remove helm namespace
+      k8s:
+        api_version: v1
+        kind: Namespace
+        name: "{{ helm_namespace }}"
+        state: absent