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]

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