Add new verify and fix targets for GH actions

[erikgb]

Today I found https://github.com/suzuki-shunsuke/pinact, which seems like a useful tool to ensure pinned actions correspond with version comments. This is something I have been trying to manually fix in a lot of our repos, but I still think there are leftovers. Having a check that an action digest corresponds to the release in the comment behind the action declaration will also improve security, but the biggest benefit IMO is to make things more human-readable and avoid PRs from Renovate just bumping a digest for an action. These PRs always make me suspicious.

I am proposing a new module for this, which could also be used as a new home for generic reusable GH workflows. I am planning to change #651 after this is merged to source the OSSF Scorecard workflow from this new module. Also planning to source https://github.com/cert-manager/makefile-modules/blob/main/.github/workflows/validate-renovate-config.yaml from the module

[cert-manager-prow]

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[Copilot]

Pull request overview

Introduces pinact into the makefile-modules toolchain and adds Make targets to verify/fix pinned GitHub Actions digests while ensuring version comments match, improving workflow readability and pinning hygiene.

Changes:

• Add pinact as a managed tool (version + Go install source).
• Add verify-pinact / fix-pinact targets under a new gh-actions module.
• Include the new module from the repository Makefile so targets participate in make verify.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
modules/tools/00_mod.mk	Adds pinact to the managed tool/version list and Go dependency install list.
modules/gh-actions/01_mod.mk	Introduces verify-pinact and fix-pinact Make targets using pinact.
Makefile	Includes the new modules/gh-actions/01_mod.mk module.

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[erikgb]

/cc @inteon