Support to set imagePullSecret when creating environment (#1429)

pkg/fission-cli/flag/flag.go

@@ -142,6 +142,7 @@ var (
 	EnvExternalNetwork        = Flag{Type: Bool, Name: flagkey.EnvExternalNetwork, Usage: "Allow pod to access external network (only works when istio feature is enabled)"}
 	EnvTerminationGracePeriod = Flag{Type: Int, Name: flagkey.EnvGracePeriod, Aliases: []string{"period"}, Usage: "Grace time (in seconds) for pod to perform connection draining before termination", DefaultValue: 360}
 	EnvVersion                = Flag{Type: Int, Name: flagkey.EnvVersion, Usage: "Environment API version (1 means v1 interface)", DefaultValue: 1}
+	EnvImagePullSecret        = Flag{Type: String, Name: flagkey.EnvImagePullSecret, Usage: "Secret for Kubernetes to pull an image from a private registry"}
 
 	KwName      = Flag{Type: String, Name: flagkey.KwName, Usage: "Watch name"}
 	KwFnName    = Flag{Type: String, Name: flagkey.KwFnName, Usage: "Function name"}

pkg/fission-cli/flag/key/key.go

@@ -96,6 +96,7 @@ const (
 	EnvExternalNetwork = "externalnetwork"
 	EnvGracePeriod     = "graceperiod"
 	EnvVersion         = "version"
+	EnvImagePullSecret = "imagepullsecret"
 
 	KwName      = resourceName
 	KwFnName    = "function"