Argo workflow GC

[rushtehrani]

Argo workflows should be cleaned up after completion and their logs and data archived.

The steps to make this work:

1. Setup S3 or equivalent store for Artifacts, see this doc
2. Set archiveLogs: true under this line. See configmap, also see feat!(logging): Always archive logs if in config. Closes #1790 argoproj/argo-workflows#1860 that fixes an issue with this flag.
3. Set Garbage collection in workflow. See this issue regarding setting global defaults for workflows.

[rushtehrani]

For 3, we'll have to inject the strategy here, this should be passed in as an option with the strategy potentially being read from an env var, example diff:

@@ -17,6 +17,8 @@ type Workflow = wfv1.Workflow
 
 type WorkflowParameter = wfv1.Parameter
 
+type PodGCStrategy = wfv1.PodGCStrategy
+
 type WorkflowOptions struct {
        Name           string
        GeneratedName  string
@@ -25,6 +27,7 @@ type WorkflowOptions struct {
        ServiceAccount string
        Labels         *map[string]string
        ListOptions    *ListOptions
+       PodGCStrategy  *PodGCStrategy
 }
 
 func unmarshalWorkflows(wfBytes []byte, strict bool) (wfs []Workflow, err error) {
@@ -81,6 +84,11 @@ func (c *Client) create(namespace string, wf *Workflow, opts *WorkflowOptions) (
        if opts.Labels != nil {
                wf.ObjectMeta.Labels = *opts.Labels
        }
+       if wf.Spec.PodGC != nil {
+               wf.Spec.PodGC = &wfv1.PodGC{
+                       Strategy: *opts.PodGCStrategy,
+               }
+       }
 
        createdWorkflow, err = c.ArgoprojV1alpha1().Workflows(namespace).Create(wf)