ci: track latest stable LLVM major via Renovate - #81
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Replace the hardcoded LLVM/clang version in the Dockerfile with an LLVM_VERSION build argument and add a Renovate regex manager that follows llvm/llvm-project GitHub releases. The extract pattern matches only final llvmorg-X.Y.Z tags, so release candidates never trigger a bump; if apt.llvm.org lags a new major, the Renovate PR's container build fails and gates the merge until packages are published. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
The Dockerfile pinned clang/LLVM to a hardcoded
22with no mechanism to learn about newer stable releases. This makes the version Renovate-managed:LLVM_VERSIONbuild argument (global + per-stage), replacing all hardcoded occurrences — the apt.llvm.org repository line, 12 package names, and 8update-alternativesregistrations across the base and devcontainer stagesllvm/llvm-projectGitHub releases.extractVersionTemplatematches only finalllvmorg-X.Y.Ztags, so-rcprereleases can never trigger a bump; only the major number is extracted (22→23when LLVM 23 ships)Test plan
LLVM_VERSION=22: clang, clang-tidy, clang-format, lldb, and llvm-config all resolve to 22.1.8 via the alternatives symlinks; Valgrind 3.27.1 unaffected🤖 Generated with Claude Code