fix cache directory

.gitea/workflows/ci.yml

@@ -26,15 +26,8 @@ jobs:
           tags: cproject-builder:latest
           push: false
           load: true
-          cache-from: type=local,src=/tmp/docker/${{ runner.os }}-builder-image.tar
-          cache-to: type=local,dest=/tmp/docker/${{ runner.os }}-builder-image.tar
-      -
-        name: Upload docker image
-        uses: actions/upload-artifact@v3
-        with:
-          name: ${{ runner.os }}-docker-${{ steps.dockerfile-hash.outputs.hash }}
-          path: /tmp/docker/${{ runner.os }}-builder-image.tar
-          retention-days: 3
+          cache-from: type=local,src=/tmp/docker
+          cache-to: type=local,dest=/tmp/docker
       -
         name: Build library
         uses: https://github.com/addnab/docker-run-action@v3