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GitHub Actions Matrix Builder

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Build a GitHub Actions strategy.matrix with axes, include and exclude entries, fail-fast and max-parallel, and preview the resulting job combinations.

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Workflow job
GitHub limits a matrix to 256 jobs per workflow run. Excludes are applied to the generated combinations first, then includes add or extend entries.
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Frequently Asked Questions
How does include work?
An include entry extends matching combinations with extra keys, or adds a new job if it matches none.
How does exclude work?
It removes combinations matching all the keys listed.
How many jobs can a matrix create?
GitHub allows up to 256 jobs per workflow run from a matrix.
Is the YAML ready to paste?
Yes, drop it under the job in your workflow file.
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