Fix single platform build on buildx >= 0.10

Fix single platform build on buildx >= 0.10

Use buildx by default; add multi platform build

Add docker build kit support (#7)

Download private assets with PAT (#4)

* ✨ downloading assets action, editorcfg

* 💄 cosmetics

* 📝 add ref to readme

* 🔥 simplify - use curl everywhere

Fix wrong repo/tag

Change build-push-ecr action to accept docker build args

Add aws role