Add automated pull request labeling workflow

.github/labeler.yml

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+# Core library files
+'core':
+  - changed-files:
+    - any-glob-to-any-file: ['lib/**/*']
+
+# Application logic
+'application':
+  - changed-files:
+    - any-glob-to-any-file: ['lib/application.js']
+
+# Request/Response handling
+'request':
+  - changed-files:
+    - any-glob-to-any-file: ['lib/request.js']
+
+'response':
+  - changed-files:
+    - any-glob-to-any-file: ['lib/response.js']
+
+# Routing
+'router':
+  - changed-files:
+    - any-glob-to-any-file: ['lib/router/**/*']
+
+# Views and templating
+'view':
+  - changed-files:
+    - any-glob-to-any-file: ['lib/view.js']
+
+# Utilities
+'utils':
+  - changed-files:
+    - any-glob-to-any-file: ['lib/utils.js']
+
+# Tests
+'tests':
+  - changed-files:
+    - any-glob-to-any-file: 
+      - 'test/**/*'
+      - '**/*.test.js'
+      - '**/*.spec.js'
+
+# Examples
+'examples':
+  - changed-files:
+    - any-glob-to-any-file: ['examples/**/*']
+
+# Documentation
+'docs':
+  - changed-files:
+    - any-glob-to-any-file:
+      - '*.md'
+      - '**/*.md'
+      - 'docs/**/*'
+
+# Configuration files
+'config':
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'package.json'
+      - 'package-lock.json'
+      - '.eslintrc*'
+      - '.gitignore'
+      - '.github/**/*'
+      - '*.json'
+      - '*.yml'
+      - '*.yaml'
+
+# Benchmarks
+'benchmarks':
+  - changed-files:
+    - any-glob-to-any-file: ['benchmarks/**/*']
+
+# Security related
+'security':
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'SECURITY.md'
+      - '.github/workflows/codeql.yml'
+      - '.github/workflows/scorecard.yml'
+
+# CI/CD
+'ci':
+  - changed-files:
+    - any-glob-to-any-file: 
+      - '.github/workflows/**/*'
+      - '.github/dependabot.yml'
+
+# Dependencies
+'dependencies':
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'package.json'
+      - 'package-lock.json'
+
+# Breaking changes (based on certain core files)
+'breaking change':
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'index.js'
+      - 'lib/express.js'
+      - 'lib/application.js'

.github/workflows/labeler.yml

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+name: "Pull Request Labeler"
+
+on:
+  pull_request:
+    types: [opened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        persist-credentials: false
+
+    - name: Label Pull Request
+      uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9 # v5.0.0
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        configuration-path: '.github/labeler.yml'
+        sync-labels: true

create-labels.sh

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+#!/bin/bash
+
+# Script to create GitHub labels with custom colors for the Express.js repository
+# Run this script with: bash create-labels.sh
+
+echo "Creating GitHub labels with custom colors..."
+
+# Component labels - Different vibrant colors
+gh label create "core" --color "0052cc" --description "Changes to core library files" --force
+gh label create "application" --color "1f77b4" --description "Changes to application logic" --force
+gh label create "request" --color "2ca02c" --description "Changes to request handling" --force
+gh label create "response" --color "ff7f0e" --description "Changes to response handling" --force
+gh label create "router" --color "d62728" --description "Changes to routing functionality" --force
+gh label create "view" --color "9467bd" --description "Changes to view/templating" --force
+gh label create "utils" --color "8c564b" --description "Changes to utility functions" --force
+gh label create "tests" --color "e377c2" --description "Changes to test files" --force
+gh label create "examples" --color "7f7f7f" --description "Changes to example code" --force
+gh label create "docs" --color "17becf" --description "Changes to documentation" --force
+gh label create "config" --color "bcbd22" --description "Changes to configuration files" --force
+gh label create "benchmarks" --color "ff9896" --description "Changes to benchmark files" --force
+gh label create "security" --color "c5b0d5" --description "Changes to security-related files" --force
+gh label create "ci" --color "c49c94" --description "Changes to CI/CD workflows" --force
+
+# Special labels - Distinct colors
+gh label create "dependencies" --color "0366d6" --description "Changes to package dependencies" --force
+gh label create "breaking change" --color "b60205" --description "Changes that may break compatibility" --force
+
+# Size labels - Gradient from green to red
+gh label create "small" --color "00ff00" --description "Small changes (1-3 files)" --force
+gh label create "medium" --color "ffff00" --description "Medium changes (4-10 files)" --force
+gh label create "large" --color "ff8000" --description "Large changes (11-50 files)" --force
+gh label create "extra-large" --color "ff0000" --description "Extra large changes (51+ files)" --force
+
+echo "✅ All labels created successfully!"
+echo "You can view them at: https://github.com/$(gh repo view --json owner,name -q '.owner.login + \"/\" + .name')/labels"