Exclude dir - #4
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A `/**` sweep takes every package under a directory, which is the wrong granularity when one package in the tree must not move — a benchmark pinned to an old toolchain on purpose, say. Without a way to carve it back out, the whole glob has to be abandoned for an explicit list that goes stale as packages are added. An entry prefixed with `!` now subtracts: it names a directory and drops that directory together with everything beneath it, so `benchmarks/** !benchmarks/pinned` covers the tree and spares the one package. Exclusions live in `lake_package_directory` rather than in an input of their own so that no step invoking the action needs a second environment variable kept in sync with the first. Matching compares path components, not string prefixes, so `!benchmarks/slow` cannot swallow `benchmarks/slowfixture`, while trailing slashes and `./` prefixes still name the same directory. An exclusion carrying a glob is rejected, since it already reaches its whole subtree, and one matching nothing is reported: a typo there silently updates the package it was meant to protect.
![github-advanced-security[bot]](https://avatars.githubusercontent.com/in/57789?s=60&v=4){kind=small}
Without a `permissions` block the jobs run with whatever the repository grants by default, which on many repositories is write access to contents, issues, and pull requests. The E2E jobs update fixtures only inside the runner's own checkout and never write back, and the action's `gh` calls read the public list of Lean releases, so `contents: read` covers everything they do.
Neither workflow writes to the repository: both build and assert inside the runner's own checkout, and the `gh` calls underneath read public data. Without a `permissions` block they ran with whatever the repository grants by default, which is commonly write access to contents, issues, and pull requests.
The App token existed only to work around GitHub's guard against a workflow triggering itself, which leaves a GITHUB_TOKEN pull request with no CI runs until a maintainer releases them. Trading that back for one fewer credential to install and rotate means the self-update PR opens with checks pending until someone pushes to the branch or closes and reopens it. The job needs contents and pull-requests write to open the PR, and issues write for the default `on_update_fails: issue` path.
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Adds a
!prefix to thelake_package_directoryarg which will exclude the given pattern from the paths that lean-update runs over.Also bumps flake.lock for lean4-nix v4.33.1