Publish installer builds for Arm Linux

Got me one of those snapdragon processors in my lenovo laptop - the ubuntu repos don't have arm:

```
Notice: Skipping acquire of configured file 'main/binary-arm64/Packages' as repository 'https://apt.releases.hashicorp.com plucky InRelease' doesn't support architecture 'arm64'
```

https://releases.hashicorp.com/vagrant/2.4.9/

^ all I see is darwin_arm64