security: fix CodeQL code-injection alerts in CI workflows

[Copilot]

Several GitHub Actions workflows were interpolating ${{ }} expressions directly inside run: shell scripts, enabling code injection via user-controlled values (PR title, labels, workflow inputs).

Changes

validate-pr.yml — code injection (alerts #41, #42)

Moved all ${{ github.event.pull_request.* }} and step-output expressions out of the run: shell script into an env: block; switched from echo to printf '%s\n' for safe output.

# Before — PR title injected directly into shellecho "${{ github.event.pull_request.title }}" > ./pr-validation/TITLE# After — passed via env; shell only sees opaque variableenv:
PR_TITLE: ${{ github.event.pull_request.title }}run: | printf '%s\n' "$PR_TITLE" > ./pr-validation/TITLE

central-loader.yml — code injection (alerts #17–#28)

inputs.templates was the one remaining expression interpolated directly in the run: script (TEMPLATES="${{ inputs.templates }}"). Moved it into the existing env: block alongside the other inputs that were already safely handled there; removed the now-redundant shell assignment.

Original prompt

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This section details on the original issue you should resolve

<issue_title>🔒 Security Review: CodeQL Alerts Require Manual Fixes</issue_title>
<issue_description>Security Alerts Requiring Manual Review

The following CodeQL alerts cannot be automatically fixed and require manual intervention:

Alert #50: actions/untrusted-checkout/high

• Severity: error
• File: .github/workflows/automerge.yml:266
• Message: Potential execution of untrusted code on a privileged workflow (workflow_run)

Alert #47: actions/untrusted-checkout/high

• Severity: error
• File: .github/workflows/automerge.yml:235
• Message: Potential execution of untrusted code on a privileged workflow (workflow_run)

Alert #42: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/validate-pr.yml:75
• Message: Potential code injection in ${{ github.event.pull_request.title }}, which may be controlled by an external user.

Alert #41: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/validate-pr.yml:74
• Message: Potential code injection in ${{ github.event.pull_request.head.label }}, which may be controlled by an external user.

Alert #28: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:145
• Message: Potential code injection in ${{ steps.vars.outputs.current_year }}, which may be controlled by an external user.

Alert #27: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:144
• Message: Potential code injection in ${{ steps.vars.outputs.stability_color }}, which may be controlled by an external user.

Alert #26: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:142
• Message: Potential code injection in ${{ inputs.license_type }}, which may be controlled by an external user.

Alert #25: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:141
• Message: Potential code injection in ${{ inputs.short_description }}, which may be controlled by an external user.

Alert #24: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:140
• Message: Potential code injection in ${{ inputs.short_description }}, which may be controlled by an external user.

Alert #23: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:139
• Message: Potential code injection in ${{ steps.vars.outputs.repo_url }}, which may be controlled by an external user.

Alert #22: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:138
• Message: Potential code injection in ${{ steps.vars.outputs.repo_owner }}, which may be controlled by an external user.

Alert #21: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:137
• Message: Potential code injection in ${{ steps.vars.outputs.repo_name }}, which may be controlled by an external user.

Alert #20: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:136
• Message: Potential code injection in ${{ steps.vars.outputs.project_name }}, which may be controlled by an external user.

Alert #19: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:143
• Message: Potential code injection in ${{ inputs.templates }}, which may be controlled by an external user.

Alert #18: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:143
• Message: Potential code injection in ${{ inputs.stability }}, which may be controlled by an external user.

Alert #17: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:113
• Message: Potential code injection in ${{ inputs.stability }}, which may be controlled by an external user.

Alert #16: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:106
• Message: Potential code injection in ${{ inputs.project_name }}, which may be controlled by an external user.

Alert #15: actions/code-injection/medium

• Severity: warning
• File: .github/workflows/central-loader.yml:102
• Message: Potential code injecti...

• Fixes🔒 Security Review: CodeQL Alerts Require Manual Fixes #39

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[xaoscience]

Perhaps leave --no-verify out of it, as it is guarded and so we don't need to manually sign - but I will test!

[Copilot]

Perhaps leave --no-verify out of it, as it is guarded and so we don't need to manually sign - but I will test!

Removed --no-verify from both git merge calls in f812a81. The remaining changes (code injection fixes via env: blocks) are unaffected.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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