I used this exact idea to do not just containers but cross compiled containers with cached artifacts using cachix, https://github.com/openenergysolutions/openfm

I used this exact idea to do not just containers but cross compiled containers with cached artifacts using cachix, https://github.com/openenergysolutions/openfmb.adapters https://github.com/openenergysolutions/openfmb.adapters for a size-able example perhaps