Is that possible to make cache between builds?

[Zxilly]

As title described, is that possible to store cache to github actions cache?

[cmangla]

PR #42 adds some caching for docker layers using GH Actions cache.

[Zxilly]

I think the layer of docker image was not the key point of the cost. Should enable ccache in the openwrt make system and export the cache to GitHub Actions.