⚡ perf: optimize cache check using docker manifest inspect

.gitea/workflows/ci-cd.yaml

@@ -76,15 +76,18 @@ jobs:
           echo "Dependency hash: $DEPS_HASH"
           echo "deps_hash=$DEPS_HASH" >> $GITHUB_OUTPUT
 
-      - name: Check for existing cache
+      - name: Check for existing cache (optimized)
         id: check_cache
         run: |
-          # Check if image exists in registry
+          # Check if image exists in registry using optimized approach
           IMAGE_NAME="${{ env.CI_REGISTRY }}/${{ env.GITEA_ORG }}/${{ env.GITEA_REPO }}-build-cache:${{ steps.calculate_hash.outputs.deps_hash }}"
           
-          # Try to pull the image to see if it exists
-          if docker pull "$IMAGE_NAME" >/dev/null 2>&1; then
-            echo "✅ Cache hit - using existing build cache"
+          # Fast check using docker manifest inspect (lighter than pull)
+          echo "🔍 Checking cache: $IMAGE_NAME"
+          
+          # Try manifest inspect first (fastest method)
+          if docker manifest inspect "$IMAGE_NAME" >/dev/null 2>&1; then
+            echo "✅ Cache hit - using existing build cache (manifest inspect)"
             echo "cache_hit=true" >> $GITHUB_OUTPUT
           else
             echo "⚠️  Cache miss - will build new cache image"