fix(ios): handle literal \n in public key (eg. from react-native-config)

Author: Minishlink

ios/CodePush/CodePushUpdateUtils.m

@@ -291,6 +291,9 @@ + (BOOL)verifyFolderHash:(NSString *)finalUpdateFolder
 // remove BEGIN / END tags and line breaks from public key string
 + (NSString *)getKeyValueFromPublicKeyString:(NSString *)publicKeyString
 {
+    publicKeyString = [publicKeyString stringByReplacingOccurrencesOfString:@"\\n"
+                                                                 withString:@"\n"];
+
     publicKeyString = [publicKeyString stringByReplacingOccurrencesOfString:@"-----BEGIN PUBLIC KEY-----\n"
                                                                  withString:@""];
     publicKeyString = [publicKeyString stringByReplacingOccurrencesOfString:@"-----END PUBLIC KEY-----"