Centralize gosec exclusions in .golangci.yml as source of truth

[Copilot]

Gosec exclusions were duplicated across Makefile and GitHub Actions without clear ownership, making updates error-prone.

Changes

• .golangci.yml - Established as authoritative source for exclusions list
• Makefile - Added inline comments referencing .golangci.yml
• .github/workflows/security-scan.yml - Added missing exclusions (G101, G115, G602, G301, G302, G304, G306) with reference comments
• specs/gosec.md - Documented the source of truth relationship

Implementation Notes

Gosec cannot parse .golangci.yml directly, so exclusions use command-line -exclude flags in both Makefile and GitHub Actions. Comments in all locations now explicitly reference .golangci.yml to ensure consistency during updates.

# .golangci.yml
linters-settings:
  gosec:
    # Source of truth for exclusions applied in Makefile and GitHub Actions
    exclude:
      - G101  # Hardcoded credentials (false positives)
      - G115  # Integer overflow (validated inputs)
      - G602  # Slice bounds (runtime checked)
      - G301  # Directory permissions 0755
      - G302  # File permissions 0755
      - G304  # File inclusion (validated paths)
      - G306  # WriteFile permissions 0644

# .github/workflows/security-scan.yml
- name: Run Gosec
  run: |
    # Exclusions configured in .golangci.yml (linters-settings.gosec.exclude)
    gosec -exclude=G101,G115,G602,G301,G302,G304,G306 ./...

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[plan] Centralize gosec configuration to .golangci.yml</issue_title>
<issue_description>## Objective

Move hardcoded gosec exclusions from Makefile and GitHub Actions to .golangci.yml for a single source of truth.

Context

From discussion #12003: Currently gosec exclusions are duplicated in multiple files (Makefile line 158, GitHub Actions workflow). This should be centralized in .golangci.yml for better maintainability.

Approach

1. Extract current gosec exclusions from Makefile and workflow files
2. Add gosec configuration section to .golangci.yml:

linters-settings:
  gosec:
    excludes:
      - G101  # Hardcoded credentials (false positives)
      - G115  # Integer overflow (validated inputs)
      - G602  # Slice bounds (Go runtime checks)
    config:
      G204: "0644"
      G306: "0644"

3. Update Makefile to reference .golangci.yml config
4. Update GitHub Actions to use centralized config
5. Update specs/gosec.md to reference the new location

Files to Modify

• Create/Update: .golangci.yml
• Update: Makefile (remove hardcoded flags)
• Update: .github/workflows/security.yml
• Update: specs/gosec.md

Acceptance Criteria

• All gosec exclusions moved to .golangci.yml
• Makefile references centralized config
• GitHub Actions uses centralized config
• Documentation updated
• Security scans still pass with same exclusions

Priority

MEDIUM - Best practice alignment

Estimated Effort

1 hour

AI generated by Plan Command for discussion #12003

Comments on the Issue (you are @copilot in this section)

• Fixes [plan] Centralize gosec configuration to .golangci.yml #12183

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