security: pin GitHub Actions to reviewed SHAs

[mkarson1997]

What changed

• pin checkout and setup-node in the Node 22/24 + PostgreSQL CI matrix
• upgrade/pin CodeQL from mutable v3 tags to the reviewed v4 commit
• preserve the existing aggregate CI Gate, lockfile install, typecheck, tests and build behavior

Why

FlowForge is one of the flagship infrastructure repositories. Its validation and security analysis should not depend on mutable GitHub Action tags.

Merge only after the Node/PostgreSQL matrix, CI Gate, CodeQL and SonarQube Cloud are green.

Summary by Sourcery

Pin CI and CodeQL GitHub Actions to reviewed SHAs to make repository validation and security analysis reproducible.

Enhancements:

• Pin GitHub Actions used by CI and CodeQL workflows to reviewed commit SHAs, including upgrading CodeQL to v4 while preserving existing validation behavior.

CI:

• Secure the Node.js/PostgreSQL matrix and CodeQL workflows against mutable action tags.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This security-focused change removes mutable GitHub Actions references from CI and CodeQL by pinning them to reviewed commit SHAs, while preserving the existing validation behavior and requiring the Node/PostgreSQL matrix, CI Gate, CodeQL, and SonarQube Cloud checks to pass.

File-Level Changes

Change	Details	Files
Pin CI workflow actions to immutable, reviewed commit SHAs while retaining version comments for traceability.	Pin checkout and setup-node in the Node 22/24 and PostgreSQL matrix. Keep the existing lockfile install, typecheck, test, build, and aggregate CI Gate flow unchanged.	.github/workflows/ci.yml
Upgrade CodeQL workflow actions from mutable v3 tags to the reviewed v4 commit.	Pin checkout to the reviewed SHA. Pin both CodeQL initialization and analysis actions to the same reviewed v4 SHA.	.github/workflows/codeql.yml

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud