Add --cacert flag to velero cli commands (#2364)

* Add --cacert flag to velero cli commands

Adds a --cacert flag to the log and describe commands
that takes a path to a PEM-encoded certificate bundle
as an alternative to --insecure-skip-tls-verify for
dealing with self-signed certificates.

Signed-off-by: Sam Lucidi <slucidi@redhat.com>

pkg/client/config.go

@@ -28,6 +28,7 @@ import (
 const (
 	ConfigKeyNamespace = "namespace"
 	ConfigKeyFeatures  = "features"
+	ConfigKeyCACert    = "cacert"
 )
 
 // VeleroConfig is a map of strings to interface{} for deserializing Velero client config options.
@@ -110,6 +111,19 @@ func (c VeleroConfig) Features() []string {
 	return strings.Split(features, ",")
 }
 
+func (c VeleroConfig) CACertFile() string {
+	val, ok := c[ConfigKeyCACert]
+	if !ok {
+		return ""
+	}
+	caCertFile, ok := val.(string)
+	if !ok {
+		return ""
+	}
+
+	return caCertFile
+}
+
 func configFileName() string {
 	return filepath.Join(os.Getenv("HOME"), ".config", "velero", "config.json")
 }