cli: create backups for CRDs and their resources

These backups could be used in case an upgrade
misbehaves after helm declared it as successful.
The manual backups are required as helm-rollback
won't touch custom resources and changes to CRDs
delete resources of the old version.

cli/internal/helm/client_test.go

@@ -12,39 +12,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestParseCRDs(t *testing.T) {
-	testCases := map[string]struct {
-		data    string
-		wantErr bool
-	}{
-		"success": {
-			data:    "apiVersion: apiextensions.k8s.io/v1\nkind: CustomResourceDefinition\nmetadata:\n  name: nodeimages.update.edgeless.systems\nspec:\n  group: update.edgeless.systems\n  names:\n    kind: NodeImage\n",
-			wantErr: false,
-		},
-		"wrong kind": {
-			data:    "apiVersion: v1\nkind: Secret\ntype: Opaque\nmetadata:\n  name: supersecret\n  namespace: testNamespace\ndata:\n  data: YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWE=\n",
-			wantErr: true,
-		},
-		"decoding error": {
-			data:    "asdf",
-			wantErr: true,
-		},
-	}
-
-	for name, tc := range testCases {
-		t.Run(name, func(t *testing.T) {
-			assert := assert.New(t)
-
-			_, err := parseCRD([]byte(tc.data))
-			if tc.wantErr {
-				assert.Error(err)
-				return
-			}
-			assert.NoError(err)
-		})
-	}
-}
-
 func TestIsUpgrade(t *testing.T) {
 	testCases := map[string]struct {
 		currentVersion string