docs: add build from source code guide (#431)

chore: fix CI docker release tag (#428)

Signed-off-by: Keming <kemingy94@gmail.com>

README.md

@@ -47,12 +47,20 @@ Mosec is a high-performance and flexible model serving framework for building ML
 
 ## Installation
 
-Mosec requires Python 3.7 or above. Install the latest [PyPI package](https://pypi.org/project/mosec/) with:
+Mosec requires Python 3.7 or above. Install the latest [PyPI package](https://pypi.org/project/mosec/) for Linux x86_64 or macOS x86_64 with:
 
 ```shell
 pip install -U mosec
 ```
 
+To build from the source code, install [Rust](https://www.rust-lang.org/) and run the following command:
+
+```shell
+make package
+```
+
+You will get a mosec wheel in the `/dist` folder.
+
 ## Usage
 
 We demonstrate how Mosec can help you easily host a pre-trained stable diffusion model as a service. You need to install [diffusers](https://github.com/huggingface/diffusers) and [transformers](https://github.com/huggingface/transformers) as prerequisites: