container 0.3.0 (new formula)

[unitof]

Reopen of #226884, now that Homebrew/brew#20062 is merged and 4.6.0 released with preliminary Tahoe (& Xcode 26) support.

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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[unitof]

I think this may actually build on Linux, but 0.3.0 requires Swift 6.2.0, so will recheck once [email protected] released on Homebrew for Linux.

[stefanb]

Test could be also performed with curl, not just listing running containers.

[carlocab]

Note: this hasn't actually built anything (see https://github.com/Homebrew/homebrew-core/actions/runs/16762312038/job/47460475050#step:3:1), so even if CI is green, merging will likely fail when attempting to publish bottles, or when checking the published bottles (because none will have been published).

[p-linnane]

This is still premature. Until we have macOS 26 CI runners with Xcode 26 installed, we cannot build/test this.