Speed-up danger swift on Bitrise

Hi, do you know a way to speed up the installation of danger-swift on Bitrise? Currently it takes me 4 minutes for the step

````
+---+---------------------------------------------------------------+----------+
| ✓ | Brew install danger-swift | 4.1 min |
+---+---------------------------------------------------------------+----------+
````

Step detail:
````
Run brew command
$ brew "install" "danger/tap/danger-swift"
==> Tapping danger/tap
Cloning into '/usr/local/Homebrew/Library/Taps/danger/homebrew-tap'...
Tapped 3 formulae (30 files, 124.2KB).
==> Installing danger-swift from danger/tap
==> Downloading https://github.com/danger/danger-js/releases/download/10.6.0/danger-macos.zip
==> Downloading from https://github-production-release-asset-2e65be.s3.amazonaws.com/66146807/e1523e80-4edb-11eb-840e-b4523ac1fca2?X-Amz-Algorithm=AWS4-HMAC-SHA236&X-Amz-Credential=AKIAIWNJYAX2H53A%2F20210115%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20210115T170144Z&X-Amz-Expires=300&X-Amz-Signature=c151fbfcf171f7c7abd2f07b28a6ddd3a459ef6f0ba7a58045fd93bfeaaac3c5&X-Amz-SignedHeaders=host&actor_id=0&key_id=0&repo_id=66146807&response-content-disposition=attachment%3B%20filename%3Ddanger-macos.zip&response-content-type=application%2Foctet-stream
==> Downloading https://github.com/danger/danger-swift/archive/3.7.1.tar.gz
==> Downloading from https://codeload.github.com/danger/swift/tar.gz/3.7.1
==> Installing dependencies for danger/tap/danger-swift: danger/tap/danger-js
==> Installing danger/tap/danger-swift dependency: danger/tap/danger-js
🍺 /usr/local/Cellar/danger-js/10.6.0: 3 files, 84MB, built in 5 seconds
==> Installing danger/tap/danger-swift
==> make install PREFIX=/usr/local/Cellar/danger-swift/3.7.1
🍺 /usr/local/Cellar/danger-swift/3.7.1: 19 files, 11.5MB, built in 2 minutes 42 seconds
````