chore: install deps and create foundry user in cross built image

[grandizzy]

Motivation

• install git and create foundry user inside Docker image - needed to build a project mounted inside container
• use same alpine image as regular Dockerfile
  

  foundry/Dockerfile

  Lines 33 to 42 in 2509ce2

  	FROM alpine:3.20 as foundry-client
  	RUN apk add --no-cache linux-headers git gcompat libstdc++
  	COPY --from=build-environment /opt/foundry/out/forge /usr/local/bin/forge
  	COPY --from=build-environment /opt/foundry/out/cast /usr/local/bin/cast
  	COPY --from=build-environment /opt/foundry/out/anvil /usr/local/bin/anvil
  	COPY --from=build-environment /opt/foundry/out/chisel /usr/local/bin/chisel
  	RUN adduser -Du 1000 foundry

Solution

[mattsse]

makes sense

[mattsse]

I remember having to do something like this a while ago on something else

[grandizzy]

yeah, for this case is for being able to map host user to container user so there's no issue with volumes mapped permissions (resulting in git failure fatal: detected dubious ownership in repository)