Invalid Workflow spec results in panic

[kevdowney]

Is this a BUG REPORT or FEATURE REQUEST?:
BUG
What happened:

{"level":"dpanic","ts":1621359024.5573485,"logger":"controllers.Addon","msg":"odd number of arguments passed as key-value pairs for logging","addon":"addon-manager-system/efs-csi","ignored key":"interface conversion: interface {} is nil, not []interface {}","stacktrace":"github.com/go-logr/zapr.handleFields\n\t/Users/kdowney/go/pkg/mod/github.com/go-logr/zapr@v0.2.0/zapr.go:100\ngithub.com/go-logr/zapr.(*zapLogger).Info\n\t/Users/kdowney/go/pkg/mod/github.com/go-logr/zapr@v0.2.0/zapr.go:127\ngithub.com/keikoproj/addon-manager/controllers.(*AddonReconciler).execAddon.func1\n\t/Users/kdowney/go/src/github.com/keikoproj/addon-manager/controllers/addon_controller.go:128\nruntime.gopanic\n\t/usr/local/Cellar/go/1.15.2/libexec/src/runtime/panic.go:969\nruntime.panicdottypeE\n\t/usr/local/Cellar/go/1.15.2/libexec/src/runtime/iface.go:261\ngithub.com/keikoproj/addon-manager/pkg/workflows.(*workflowLifecycle).configureWorkflowArtifacts\n\t/Users/kdowney/go/src/github.com/keikoproj/addon-manager/pkg/workflows/workflow.go:331\ngithub.com/keikoproj/addon-manager/pkg/workflows.(*workflowLifecycle).Install\n\t/Users/kdowney/go/src/github.com/keikoproj/addon-manager/pkg/workflows/workflow.go:84\ngithub.com/keikoproj/addon-manager/controllers.(*AddonReconciler).runWorkflow\n\t/Users/kdowney/go/src/github.com/keikoproj/addon-manager/controllers/addon_controller.go:425\ngithub.com/keikoproj/addon-manager/controllers.(*AddonReconciler).processAddon\n\t/Users/kdowney/go/src/github.com/keikoproj/addon-manager/controllers/addon_controller.go:325\ngithub.com/keikoproj/addon-manager/controllers.(*AddonReconciler).execAddon\n\t/Users/kdowney/go/src/github.com/keikoproj/addon-manager/controllers/addon_controller.go:132\ngithub.com/keikoproj/addon-manager/controllers.(*AddonReconciler).Reconcile\n\t/Users/kdowney/go/src/github.com/keikoproj/addon-manager/controllers/addon_controller.go:122\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/Users/kdowney/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.6.3/pkg/internal/controller/controller.go:244\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/Users/kdowney/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.6.3/pkg/internal/controller/controller.go:218\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).worker\n\t/Users/kdowney/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.6.3/pkg/internal/controller/controller.go:197\nk8s.io/apimachinery/pkg/util/wait.BackoffUntil.func1\n\t/Users/kdowney/go/pkg/mod/k8s.io/apimachinery@v0.19.0/pkg/util/wait/wait.go:155\nk8s.io/apimachinery/pkg/util/wait.BackoffUntil\n\t/Users/kdowney/go/pkg/mod/k8s.io/apimachinery@v0.19.0/pkg/util/wait/wait.go:156\nk8s.io/apimachinery/pkg/util/wait.JitterUntil\n\t/Users/kdowney/go/pkg/mod/k8s.io/apimachinery@v0.19.0/pkg/util/wait/wait.go:133\nk8s.io/apimachinery/pkg/util/wait.Until\n\t/Users/kdowney/go/pkg/mod/k8s.io/apimachinery@v0.19.0/pkg/util/wait/wait.go:90"}
{"level":"info","ts":1621359024.5573442,"logger":"controllers.Addon","msg":"Error: Panic occurred during execAdd %s/%s due to %s","addon":"addon-manager-system/efs-csi","addon-manager-system":"efs-csi"}

Addon:

apiVersion: addonmgr.keikoproj.io/v1alpha1
kind: Addon
metadata:
  name: test-addon
  namespace: addon-manager-system
spec:
  pkgName: test-addon
  pkgVersion: v0.1.0
  pkgType: composite
  pkgDescription: "efs-csi addon"
  params:
    namespace: addon-test-ns
    context:
      clusterName: my-test-cluster-k8s
      clusterRegion: us-west-2
  lifecycle:
    prereqs:
      template: |
        apiVersion: argoproj.io/v1alpha1
        kind: Workflow
        metadata:
          labels:
          workflows.argoproj.io/controller-instanceid: addon-manager-workflow-controller
        spec:
          activeDeadlineSeconds: 600
          entrypoint: prereqs-wf
          serviceAccountName: addon-manager-workflow-installer-sa

        templates:
          - name: prereqs-wf
            steps:
              - - name: efs-privatelink
                   template: efs-privatelink
                   arguments:
                     artifacts:
                     - name: doc
                        path: /tmp/efs-privatlink.yaml
                        raw:
                        data: |
                          AWSTemplateFormatVersion: '2010-09-09'
                          Description: 'EFS PrivateLink'

          - name: efs-privatelink
            inputs:
              artifacts:
                - name: doc
                  path: /tmp/efs-privatelink.yaml
            container:
              image: docker/whalesay:latest
              command: [cowsay]
              args: ["hello world"]

The specific invalidness of this template is .spec.lifecycle.prereqs.template.templates is at wrong indentation, it should be .spec.lifecycle.prereqs.template.spec.templates.

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Addon Manager version
• Kubernetes version :

$ kubectl version -o yaml

Other debugging information (if applicable):

• Addon status:

$ kubectl describe addon <addon-name>

• controller logs:

$ kubectl logs <addon-manager-pod>