fix: dynamically download the right act binary based on user os and architecture

[shubhbapna]

Fixes #23

Using a post install hook, as soon as the user runs npm i @kie/act-js, the post install script will install act as well by directly downloading the zipped releases from https://github.com/nektos/act/releases based on user's OS and architecture

[bacciotti]

LGTM

[bacciotti]

lgtm

[shubhbapna]

Windows test are failing because linux containers cannot be run in a windows runner:

• Run Docker commands on Windows actions/runner-images#1143

We could use -self-hosted platform to run it directly on windows without docker but some bash commands might not run.

For macos I suspect the 1 test that is failing might be because of the "hack" for setting up docker. I will open an issue to investigate this further but one alternative could be to rely on -self-hosted platform for the tests to run in CIs

The CI tests are failing since matrix has not been implemented. Once #20 is implemented I will fix the CI tests