Fix github builder

[AlexVCaron]

• Fixed locales generation in build system
• Fixed CRLF line endings invalidating cache using .gitattributes
  • When the repository is checked out on some platforms, files in the build systems get converted from LF to CRLF
  • The build is then run with CRLF endings, files content is hashed with those endings to create cache entries
  • On platforms checking out the system with LF endings, the cache misses because the hash with LF endings is different
• Fix github builder's targeted repositories (github and dockerhub) when on a fork
  • Fetch the fork container-scilus github repository instead of scilus using the owner defined in the github context
  • In addition to scilus, fetch cache from dockerhub repository defined by the fork's secrets
• Update dockerfile definition to 1.5.0, buildkit to 0.11 and buildx to 0.10
  • Supports checking git repositories using ADD
  • Automatic generation of SBOMs, we could use this to distribute bills of versions of the software contained in our images in a standardized manner (https://github.com/moby/buildkit/blob/v0.11.0/docs/attestations/sbom.md)
  • Cache manager can be configured to ignore caching errors (right now, errors in cache mechanisms kill the build)
  • Values in bake files can be interpolated from defined targets (Resource interpolation support docker/buildx#1434)
  • Supports null variables in bake files (bake: support null arg and label value docker/buildx#1449)

Cache mechanisms are in test, WIP status will be removed once local builders and github builders are all stable.