Revert "Added environment variable for Homebrew Cask"

This reverts commit 9b97747c4b9eda6f91517acbf10ac9680ae61ceb.
Revert "Revert "Added environment variable for Homebrew Cask""

This reverts commit f67b34b155ccc47cb7c3bfeeb2baae6d4d138079.
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