Feature/lab3

[darknesod1-netizen]

Goal

Complete Lab 3 requirements for DevOps Foundations: create a PR-gated CI/CD pipeline for QuickNotes.

Changes

• Added GitHub Actions CI workflow
• Configured separate vet, test, and lint jobs
• Added Go environment pinning with ubuntu-24.04
• Added least-privilege workflow permissions
• Pinned GitHub Actions dependencies by commit SHA
• Added submissions/lab3.md

Testing

• Ran QuickNotes locally

• Verified CI pipeline execution through pull request

• Tested:

  • go vet ./...
  • go test -race -count=1 ./...
  • golangci-lint run

• Verified successful GitHub Actions checks

Checklist

• Title is a clear sentence (≤ 70 chars)
• Commits are signed (git log --show-signature)
• CI workflow added
• vet, test, and lint checks pass
• submissions/lab3.md updated