README: add nightly centos and ubuntu status badge
![inclavare-containers](docs/image/logo.png)
-[![Nightly](https://github.com/alibaba/inclavare-containers/workflows/Nightly/badge.svg?branch=master)](https://github.com/alibaba/inclavare-containers/actions?query=workflow%3ANightly)
+[![Nightly Ubuntu SGX1](https://github.com/alibaba/inclavare-containers/workflows/Nightly%20Ubuntu%20SGX1/badge.svg?branch=master)](https://github.com/alibaba/inclavare-containers/actions?query=workflow%3A%22Nightly+Ubuntu+SGX1%22)
+[![Nightly CentOS SGX1](https://github.com/alibaba/inclavare-containers/workflows/Nightly%20CentOS%20SGX1/badge.svg?branch=master)](https://github.com/alibaba/inclavare-containers/actions?query=workflow%3A%22Nightly+CentOS+SGX1%22)
Inclavare Containers is an innovation of container runtime with the novel approach for launching protected containers in hardware-assisted Trusted Execution Environment (TEE) technology, aka Enclave, which can prevent the untrusted entity, such as Cloud Service Provider (CSP), from accessing the sensitive and confidential assets in use.
