fix: cache only when build succesfull

.github/workflows/build.yaml

@@ -99,7 +99,7 @@ jobs:
             type=local,dest=/cache/${{ github.repository }}/buildx-cache-new,mode=max
 
       - name: Move new cache if it exists
-        if: always()
+        if: steps.build-step.outcome == 'success'
         run: |
           mkdir -p /cache/${{ github.repository }}
           if [ -d /cache/${{ github.repository }}/buildx-cache-new ]; then
@@ -111,7 +111,7 @@ jobs:
           fi
 
       - name: Save Docker layer cache
-        if: always()
+        if: steps.build-step.outcome == 'success'
         uses: actions/cache/save@v4
         with:
           path: /cache/${{ github.repository }}/buildx-cache