ollama-app: add Linux support

[cho-m]

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After making any changes to a cask, existing or new, verify:

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Experimenting with this for Homebrew/homebrew-core#260946

[cho-m]

Some notes:

• Renamed cask is a bit odd now as Linux is not an app. Though not sure if worth renaming or creating a Linux-only Cask for this.
• sha256 audit when using intel: does fail due to identical checksum in universal macOS app but it passes when using x86_64:. We should pick a canonical style and improve the duplicate checksum situation.
• os is a bit odd as we need zip/dmg on macOS for app. There is a tgz but it isn't an app. Could move url to on_macos/on_linux instead, but not sure if actually better.
• Just leaving macOS zap stuff. It will cause warnings on Linux but shouldn't impact functionality as far as I'm aware.

[bevanjkay]

This is an interesting scenario, and I was waiting for the first instance of this to pop up because it was inevitable.
As we increase support for Linux across casks we will see more and more cases where what is supported has differences. I'm not sure if it's best to just put everything inside on_{system} blocks and only keep the relevant parts for each (including the zap here)?

[github-actions]

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