Update test-cache-restore.yml

Author: aparnajyothi-y

.github/workflows/test-cache-restore.yml

@@ -12,46 +12,54 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
+      # Checkout repository
       - uses: actions/checkout@v6
+
+      # Setup Node.js
       - name: Setup Node.js
         uses: actions/setup-node@v6
         with:
           node-version: '21'
 
+      # Setup pnpm only when pnpm-lock.yaml exists
       - name: Setup pnpm
         if: hashFiles('pnpm-lock.yaml') != ''
         uses: pnpm/action-setup@v4
         with:
           version: 10
           run_install: false
 
+      # Normalize runner architecture (x64 / arm64)
       - name: Normalize runner architecture
         shell: bash
         run: |
           echo "ARCH=$(echo '${{ runner.arch }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
 
+      # Detect package manager and its cache path
       - name: Detect package manager and cache path
         shell: bash
         run: |
           set -e
 
           if [ -f pnpm-lock.yaml ]; then
-            PM=pnpm
+            PACKAGE_MANAGER=pnpm
             CACHE_PATH=$(pnpm store path)
             LOCK_PATTERN="**/pnpm-lock.yaml"
           elif [ -f yarn.lock ]; then
-            PM=yarn
+            PACKAGE_MANAGER=yarn
             CACHE_PATH=$(yarn cache dir)
             LOCK_PATTERN="**/yarn.lock"
           else
-            PM=npm
+            PACKAGE_MANAGER=npm
             CACHE_PATH=$(npm config get cache)
             LOCK_PATTERN="**/package-lock.json"
           fi
 
-          echo "PACKAGE_MANAGER=$PM" >> $GITHUB_ENV
+          echo "PACKAGE_MANAGER=$PACKAGE_MANAGER" >> $GITHUB_ENV
           echo "NODE_CACHE=$CACHE_PATH" >> $GITHUB_ENV
           echo "LOCK_PATTERN=$LOCK_PATTERN" >> $GITHUB_ENV
+
+      # Debug resolved values
       - name: Debug cache variables
         shell: bash
         run: |
@@ -61,12 +69,14 @@ jobs:
           echo "NODE_CACHE=$NODE_CACHE"
           echo "LOCK_PATTERN=$LOCK_PATTERN"
 
+      # Restore dependency cache using a unified key format
       - name: Restore Node cache
         uses: actions/cache/restore@v5
         with:
           path: ${{ env.NODE_CACHE }}
           key: node-cache-${{ runner.os }}-${{ env.ARCH }}-${{ env.PACKAGE_MANAGER }}-${{ hashFiles(env.LOCK_PATTERN) }}
 
+      # Install dependencies based on detected package manager
       - name: Install dependencies
         shell: bash
         run: |
@@ -82,6 +92,8 @@ jobs:
           else
             npm ci
           fi
+
+      # Run build script if present
       - name: Build
         shell: bash
         run: |