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.
* Update README.md
without having initialised it, the verifier complains, because reading uninitialised memory from the kernel introduces a security risk.
* Update execsnoop.bpf.c
without having initialised it, the verifier complains, because reading uninitialised memory from the kernel introduces a security risk.