feat(k8s): use secret as shared source for admin private key

internal/integration/kubernetes/options.go

@@ -12,7 +12,8 @@ type Options struct {
 	WriterTokenSecretNamespace string
 	ReaderTokenSecret          string
 	ReaderTokenSecretNamespace string
-	PrivateKey                 string
+	PrivateKeySecret           string
+	PrivateKeySecretNamespace  string
 	Issuer                     string
 	Locker                     lock.Locker
 	LockTimeout                time.Duration
@@ -26,7 +27,8 @@ func NewOptions(funcs ...OptionFunc) *Options {
 		WriterTokenSecretNamespace: "",
 		ReaderTokenSecret:          "",
 		ReaderTokenSecretNamespace: "",
-		PrivateKey:                 "",
+		PrivateKeySecret:           "",
+		PrivateKeySecretNamespace:  "",
 		Issuer:                     "",
 		Locker:                     memory.NewLocker(),
 		LockTimeout:                30 * time.Second,
@@ -62,9 +64,15 @@ func WithReaderTokenSecretNamespace(namespace string) OptionFunc {
 	}
 }
 
-func WithPrivateKey(privateKeyFile string) OptionFunc {
+func WithPrivateKeySecret(secretName string) OptionFunc {
 	return func(opts *Options) {
-		opts.PrivateKey = privateKeyFile
+		opts.PrivateKeySecret = secretName
+	}
+}
+
+func WithPrivateKeySecretNamespace(namespace string) OptionFunc {
+	return func(opts *Options) {
+		opts.PrivateKeySecretNamespace = namespace
 	}
 }