fix docker image content and add basic CI check (#41)

Replace
```
docker run -it -v `pwd`/:/src/ yunwei37/ebpm:latest
```
with:
```
docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest
```

Add a basic CI check for the hello world BPF program.

src/20-tc/README.md

@@ -69,7 +69,7 @@ char __license[] SEC("license") = "GPL";
 通过容器编译：
 
 ```console
-docker run -it -v `pwd`/:/src/ yunwei37/ebpm:latest
+docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest
 ```
 
 或是通过 `ecc` 编译：