1.35.0 release

New features:
- toolchain: add arc gcc-12+ support with architecture-specific overrides
- target: add dtbs_check for schema validation
- Add support for korg-clang-22
- target: add binrpm-pkg support
- Makefile: switch to use tuxpkg for release and packaging

Bug fixes:
- tuxmake/target: Add LLVM=1 to kselftest builds when using clang
- target/kselftest: Work around kselftest parellel build issue
- target: fix bindeb-pkg support
- runtime: docker: Update base version for clang-android to debian13
- docker: fix equivs Maintainer field for newer dpkg-source
- docker: fix pip install on older Debian versions
- docker: fix gcc symlinks when base image has newer gcc
- test: fix test collection failure when clang is not installed

Documentation updates:
- README: add table of contents and clean up readme2index.sh

Container images:
- Update korg-clang-21 to 21.1.4
- support: docker: Dockerfile.base: add 'libxxhash-dev'
- Update korg-clang-21 to 21.1.5
- Update korg-clang-21 to 21.1.6
- runtime: docker: target_hosts: build for amd64 only
- support: docker: change REGISTRY to DOCKER_REGISTRY
- support: docker: push images to tuxmake registry
- Update korg-clang-21 to 21.1.7
- Update korg-clang-21 to 21.1.8
- Update README.md to reference GitHub instead of GitLab
- docker: add binutils-dev for x86_64 objtool build
- docker: Remove manual pahole build from Dockerfile.build
- docker: Set CC=clang when building pylibfdt in clang images
- docker: Remove jsonschema version pin for dtschema
- docker: clang-android: Update to r584948b (22.0.1)
- Update korg-clang-22 to 22.1.0-rc2
- docker: skip equivs fake gcc package when building natively

Testing/infrastructure:
- pyproject: update maintainers
- Reformat code for black 26.1.0
- Add GitHub Actions CI workflow
- Dockerfile.ci-archlinux: add CI container image for archlinux
- Dockerfile.ci-debian: add CI container image for debian
- Dockerfile.ci-fedora: add CI container image for fedora
- ci: add ci-image builds for debian, fedora and archlinux
- ci: add workflow_dispatch so ci-images can be triggered from UI
- ci: add tuxpkg workflow for package builds
- ci: add package repository to pages deployment