feat(argo): Add support for setting env vars for workflow controller. (#517)

Signed-off-by: Vlad Losev <vladimir.losev@sage.com>

charts/argo/values.yaml

@@ -115,6 +115,9 @@ controller:
   # service type `LoadBalancer`
   loadBalancerSourceRanges: []
   resources: {}
+  # The list of environment variable definitions to be added to the controller
+  # manages container verbatim.
+  extraEnv: []
   replicas: 1
   pdb:
     enabled: false