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[github] pre-cache llvm-project in Linux CI Docker images #133137

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[github] pre-cache llvm-project in Linux CI Docker images #133137

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11 changes: 11 additions & 0 deletions .github/workflows/containers/github-action-ci/Dockerfile
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Expand Up @@ -94,3 +94,14 @@ RUN mkdir actions-runner && \
tar xzf ./actions-runner-linux-x64-$GITHUB_RUNNER_VERSION.tar.gz && \
rm ./actions-runner-linux-x64-$GITHUB_RUNNER_VERSION.tar.gz

# Pre-cache llvm-project in these images; this works with the premerge action
# to speed up runs; cloning LLVM fresh takes >1min otherwise.
#
# A local experiment showed an explicit `git gc --aggressive` reduced this
# layer's size by ~800MB (4.1GB -> 3.3GB). Disable GC'ing
# afterward, so we don't waste time trying to do that in CI.
RUN \
git clone https://github.com/llvm/llvm-project --tags && \
cd llvm-project && \
git gc --aggressive && \
git config gc.auto 0
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