Fix SLSA provenance version

Merge pull request #40 from strombetta/codex/fix-workflows/release.ym…

…l-for-aarch64-build

Fix release workflow to build toolchains by target triple

Fix runs-on runner for arm64

Remove checksum from build pipelines. Add supported architectures table

Update fetch-sources.sh

Rimuovi opzioni obsolete di configurazione per gcc-stage2

Simplify tarball creation in release workflow

Revise README for clarity and additional sections

Updated the title and added sections for feedback, related projects, and code of conduct.