**Describe the bug** I am trying to generate master key using AWS KMS **To Reproduce** I run following command where creds.json contains the `{"access_key_id":"HIDDEN","secret_access_key":"HIDDEN","region":"use-east-1"}` ```bash docker run --rm -v ./test:/keys cossacklabs/acra-keymaker --keystore=v2 --kms_type=aws --kms_key_policy=create --generate_master_key=acra_master_key --kms_credentials_path=/keys/creds.json ``` **Expected behavior** Master key should be generated in AWS KMS