test: Introduce Helm-based functional test

This change introduces an operator functional test that is related to
the existing template-based functional test (and indeed re-uses most
elements of it).  The primary differences are:

(1) we do the install using helm
(2) the operator deployment derives its name from the helm app name

This test also configure the helm chart such that the PXC operator and
cert-manager are installed as this an underlying requirement of the
test.

Change-Id: Ibd8add5fffbe8bff798ccffebfb3c0c5eb17f619

.zuul.yaml

@@ -16,14 +16,29 @@
 - job:
     description: Operator integration tests with Kubernetes
     name: zuul-operator-functional-k8s
+    abstract: true
     parent: zuul-operator-functional
     pre-run:
       - playbooks/zuul-operator-functional/pre-k8s.yaml
-      - playbooks/zuul-operator-functional/install_templates.yaml
     nodeset: ubuntu-bionic
     vars:
       namespace: 'default'
 
+- job:
+    description: Operator integration tests with Kubernetes using templates
+    name: zuul-operator-functional-k8s-template
+    parent: zuul-operator-functional-k8s
+    pre-run:
+      - playbooks/zuul-operator-functional/install_templates.yaml
+
+- job:
+    description: Operation integration tests with Kubernetes using helm
+    name: zuul-operator-functional-k8s-helm
+    parent: zuul-operator-functional-k8s
+    pre-run:
+      - playbooks/zuul-operator-functional/pre-k8s.yaml
+      - playbooks/zuul-operator-functional/install_helm.yaml
+
 - job:
     description: Image and buildset registry job
     name: zuul-operator-build-image
@@ -113,7 +128,9 @@
         - zuul-nox-docs
         - zuul-operator-helm-lint
         - zuul-operator-build-image
-        - zuul-operator-functional-k8s:
+        - zuul-operator-functional-k8s-template:
+            dependencies: zuul-operator-build-image
+        - zuul-operator-functional-k8s-helm:
             dependencies: zuul-operator-build-image
     gate:
       jobs:
@@ -121,8 +138,10 @@
         - zuul-nox-docs
         - zuul-operator-helm-lint
         - zuul-operator-upload-image
-        - zuul-operator-functional-k8s:
+        - zuul-operator-functional-k8s-template:
             dependencies: zuul-operator-upload-image
+        - zuul-operator-functional-k8s-helm:
+            dependencies: zuul-operator-build-image
     promote:
       jobs:
         - zuul-promote-nox-docs

playbooks/zuul-operator-functional/install_helm.yaml

@@ -0,0 +1,21 @@
+- name: install and start zuul operator
+  hosts: all
+  roles:
+    - role: ensure-helm
+      vars:
+        helm_version: 3.10.1
+  vars:
+    # Override this if you are running the operator interactively
+    # locally for development.
+    install_operator: true
+    zuul_work_dir: "{{ zuul.projects['opendev.org/zuul/zuul-operator'].src_dir }}"
+  tasks:
+    - name: Install Operator
+      when: install_operator
+      command: helm install --set image.tag=latest,cert-manager.enabled=true,pxc-operator.enabled=true test helm/zuul-operator
+      args:
+        chdir: "{{ zuul_work_dir }}"
+
+    - name: Wait for operator deployment
+      when: install_operator
+      command: timeout 8m kubectl rollout status deployment/test-zuul-operator