set user read/write only permissions when creating aws cred files (#887)

Author: edwardfoyle

.changeset/angry-guests-notice.md

@@ -0,0 +1,5 @@
+---
+'@aws-amplify/backend-cli': patch
+---
+
+Create ~/.aws/config and ~/.aws/credentials files using owner read/write only. This is consistent with how the AWS CLI configures these files.

package-lock.json

@@ -16,7 +16,7 @@ void describe('configure command', () => {
   const profileController = new ProfileController();
   const mockAppendAWSFiles = mock.method(
     profileController,
-    'appendAWSFiles',
+    'createOrAppendAWSFiles',
     () => Promise.resolve()
   );
 

packages/cli/src/commands/configure/configure_profile_command.test.ts

@@ -73,7 +73,7 @@ export class ConfigureProfileCommand
       message: `Enter the AWS region to use with the '${profileName}' profile (eg us-east-1, us-west-2, etc):`,
     });
 
-    await this.profileController.appendAWSFiles({
+    await this.profileController.createOrAppendAWSFiles({
       profile: profileName,
       region,
       accessKeyId,