improves caching.

.github/workflows/ci.yml

@@ -9,6 +9,10 @@ on:
     tags:
       - 'v*.*.*'
 
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   docker:
     runs-on: [self-hosted, multiarch]
@@ -75,7 +79,7 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=registry,ref=${{ secrets.PRIVATEHUB_HOSTNAME }}/${{ secrets.PRIVATEHUB_USERNAME }}/${{ env.REPOSITORY_NAME }}:buildcache
-          cache-to: type=registry,ref=${{ secrets.PRIVATEHUB_HOSTNAME }}/${{ secrets.PRIVATEHUB_USERNAME }}/${{ env.REPOSITORY_NAME }}:buildcache,mode=max
+          cache-to: type=registry,ref=${{ secrets.PRIVATEHUB_HOSTNAME }}/${{ secrets.PRIVATEHUB_USERNAME }}/${{ env.REPOSITORY_NAME }}:buildcache,mode=min,compression=zstd
       - name: Update repo description
         uses: peter-evans/dockerhub-description@v3
         with: