ci: Add script to run CI locally using Act (#511)
ci: Add script to run CI locally using Act (#511)

Using [nektos/act: Run your GitHub Actions locally 🚀](https://github.com/nektos/act).

## How to test (on Mac)

```sh
$ brew install act
$ make ci
```

openwhyd/openwhyd,openwhyd/openwhyd,openwhyd/openwhyd,openwhyd/openwhyd,openwhyd/openwhyd