Update main.yml

Author: AnastaZIuk

.github/workflows/main.yml

@@ -42,14 +42,25 @@ jobs:
         if: env.CACHE_HIT == 'true'
         shell: pwsh
         run: |
-          docker build --cache-from app:latest -f docker/mount.dockerfile -t app:latest .
+          New-Item -Path build.log -ItemType File -Force
+          docker build --cache-from app:latest --progress=plain -f docker/mount.dockerfile -t app:latest . | Tee-Object -FilePath build.log
+          $total_steps = (Get-Content build.log | Select-String -Pattern '^Step [0-9]+/' | Measure-Object).Count
+          $cache_hits = (Get-Content build.log | Select-String -Pattern '---> Using cache' | Measure-Object).Count
+          if ($cache_hits -eq $total_steps) {
+            echo "FULL_CACHE_HIT=true" >> $env:GITHUB_ENV
+            Write-Host "Full cache hit, all layers were used from source cache."
+          } else {
+            Write-Host "Partial cache hit, some layers were rebuilt."
+          }
 
       - name: Save Docker Image to TAR
+        if: env.FULL_CACHE_HIT != 'true'
         shell: pwsh
         run: |
           docker save -o cache-image.tar app:latest
-
+      
       - name: Cache Image TAR
+        if: env.FULL_CACHE_HIT != 'true'
         uses: actions/cache@v4
         with:
           path: cache-image.tar