How to test a formula works on linux from a mac?

[emmby]

Output of brew config

HOMEBREW_VERSION: 4.4.21-42-gcf635bc
ORIGIN: https://github.com/Homebrew/brew
HEAD: cf635bc28a02d696a16df58ec77ea99524d20d7e
Last commit: 2 days ago
Branch: master
Core tap HEAD: 9acfdcf0277f82523b5621b93a48116a54d1b219
Core tap last commit: 4 minutes ago
Core tap branch: statesmith
Core tap JSON: 19 Feb 02:54 UTC
Core cask tap HEAD: 1a4d5a258478044d69d341ba8fc290212441fb79
Core cask tap last commit: 6 days ago
Core cask tap JSON: 19 Feb 02:54 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 11
HOMEBREW_NO_INSTALL_FROM_API: set
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.3.7 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.3.7/bin/ruby
CPU: 11-core 64-bit arm_lobos
Clang: 16.0.0 build 1600
Git: 2.39.5 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 15.3.1-arm64
CLT: 16.2.0.0.1.1733547573
Xcode: 16.2
Rosetta 2: false

Output of brew doctor

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: You have uncommitted modifications to Homebrew/homebrew-core.
If this is a surprise to you, then you should stash these modifications.
Stashing returns Homebrew to a pristine state but can be undone
should you later need to do so for some reason.
  cd /opt/homebrew/Library/Taps/homebrew/homebrew-core && git stash -u && git clean -d -f

Uncommitted files:
   M Formula/s/statesmith.rb

Warning: Some taps are not on the default git origin branch and may not receive
updates. If this is a surprise to you, check out the default branch with:
  git -C $(brew --repo homebrew/core) checkout master

Description of issue

I am writing a formula. I can test the formula works for macs on my own mac. How do I test the formula works on linux before I push a PR?

• I tried installing homebrew in a linux docker container, but the homebrew installer says linux is not supported on arm.
• I thought okay, I've got a fork of homebrew-core, I can just run the tests action on my fork. But they don't run on push and I don't see an option to manually trigger them.
• I currently have an open PR which triggers the tests, but this is a noisy way to debug my linux tests.

Am I doing this the hard way?

[gromgit]

I tried installing homebrew in a linux docker container, but the homebrew installer says linux is not supported on arm.

Try spinning up an (emulated) x86 Ubuntu VM with something like UTM.

[emmby]

It looks like support is coming to address this natively without an x86 emulator: Homebrew/brew#19208

[gromgit]

It is, but there's no committed timeline, so for now, you're stuck with either an emulated VM, or SSH to an x86 Linux box.