Split Dockerfile by Builder

[ludgerpaehler]

To be able to bump the number of builders, we need to consider how we can potentially split out the builders into separate Docker-containers, i.e.:

Dockerfile.spack
Dockerfile.rust
...

This would in turn also make the Docker containers a lot smaller, and more controlled in scope.

• DOCKERFILE.codon
• DOCKERFILE.fortran
• DOCKERFILE.go
• DOCKERFILE.haskell
• DOCKERFILE.java
• DOCKERFILE.javascript
• DOCKERFILE.julia
• DOCKERFILE.numba
• DOCKERFILE.rust
• DOCKERFILE.spack
• DOCKERFILE.swift
• DOCKERFILE.zig

[ludgerpaehler]

Package as is, is launched out of the container so the splitting into separate Dockerfiles fits in with that approach.

[ludgerpaehler]