Add option to suppress diff on apply (#1092)

* Add option to suppress diff on apply

Add --supress-diff option on apply. Usable for fresh installs when a
lot of output is produces by diff.

Resolves #458

* fix tests for suppress-diff

main.go

@@ -338,6 +338,10 @@ func main() {
 					Name:  "suppress-secrets",
 					Usage: "suppress secrets in the diff output. highly recommended to specify on CI/CD use-cases",
 				},
+				cli.BoolFlag{
+					Name:  "suppress-diff",
+					Usage: "suppress diff in the output. Usable in new installs",
+				},
 				cli.BoolFlag{
 					Name:  "skip-deps",
 					Usage: "skip running `helm repo update` and `helm dependency build`",
@@ -538,6 +542,10 @@ func (c configImpl) SuppressSecrets() bool {
 	return c.c.Bool("suppress-secrets")
 }
 
+func (c configImpl) SuppressDiff() bool {
+	return c.c.Bool("suppress-diff")
+}
+
 // DeleteConfig
 
 func (c configImpl) Purge() bool {