ci: Add caching

Author: bbhtt

.github/workflows/docker.yml

@@ -46,6 +46,8 @@ jobs:
             org.opencontainers.image.revision=${{ github.sha }}
             org.opencontainers.image.source=ssh://[email protected]:${{ github.repository }}.git
             org.opencontainers.image.url=https://github.com/${{ github.repository }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
 
       - name: Create and push manifest
         run: |