ci: harden GitHub Actions workflows and add zizmor scan - #267
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Add a CI job that runs the zizmor static analyzer over the workflow files under .github/, and apply the corresponding hardening so the existing workflows pass the audit: - add persist-credentials: false to every actions/checkout step that lacked it, so the checkout token is not left in the runner's git config for later steps to reuse - narrow top-level permissions: read-all to permissions: contents: read - add a 7-day cooldown to the dependabot update entries CI/configuration-only; no library code, tests, or docs are affected.
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Summary
Adds a CI job that runs the zizmor static analyzer over the workflow files under
.github/, and applies the corresponding hardening so the existing workflows pass the audit.zizmoraudits GitHub Actions workflows for supply-chain and privilege-escalation weaknesses — credential persistence through the checkout token, overly broadGITHUB_TOKENpermissions, template injection via${{ ... }}expansion inrun:blocks, and unpinned action references.Changes
.github/workflows/zizmor.yml— runs the zizmor scan on push tomainand on pull requests. Top-levelpermissions: {}, job-levelcontents: read,min-severity: mediumso informational template-injection notes on internally-defined values annotate without gating CI.persist-credentials: falseadded to everyactions/checkoutstep that lacked it, so the checkout token is not left in the runner's git config for later steps to reuse.permissions: read-alltopermissions: contents: readin every workflow that used the broad default.cooldownadded to bothdependabot.ymlupdate entries.This is a CI/configuration-only change; no library code, tests, or documentation are affected.