Lab 3 - T.Shekhmametyev

[Littlepr1nce]

Goal

Implement a PR-gated CI pipeline for QuickNotes using GitHub Actions with caching, build matrix, path filtering and pipeline optimizations.

Changes

• Added .github/workflows/ci.yml with three independent jobs: vet, test and lint
• Set permissions: contents: read following the least privilege principle
• Pinned the runner to ubuntu-24.04
• Pinned all third-party GitHub Actions by full SHA
• Enabled Go caching via actions/setup-go
• Added a build matrix for Go 1.23 and 1.24 with fail-fast: false
• Added path filters to skip CI for documentation-only changes
• Added bonus optimizations: concurrency, GOFLAGS=-buildvcs=false and timeout-minutes
• Configured branch protection on the fork's main branch
• Added submissions/lab3.md containing timing measurements, design question answers and bottleneck analysis

Testing

• Deliberate failure test: intentionally broke app/handlers_test.go to verify that CI blocks merging
• Fix verification: restored the test and confirmed successful CI execution
• Branch protection: configured required checks for vet, test and lint
• Performance measurements: captured baseline, cache, cache + matrix and bonus optimization runs

Checklist

• Title is a clear sentence (≤ 70 chars)
• Commits are signed (git log --show-signature)
• submissions/lab3.md updated