[GitHub][docker] Add python3 venv package to CI container

[vbvictor]

I'm trying to make pr-code-format.yml job run natively on ci-ubuntu-24.04 container.
As it appears, ci-ubuntu-24.04 already has latest clang-format, python3.12 installed, but python3.12 needs venv to work properly, and Ubuntu asks for python3-venv package to be installed to create a venv.

FYI I hacked it with --break-system-packages to test and clang-format job runs a lot faster https://github.com/llvm/llvm-project/actions/runs/18064896361/job/51406365488#logs (skipping 1min long clang-format installation). Just don't look at "Initialize containers" taking 6min, it usually takes 15-20sec

[llvmbot]

@llvm/pr-subscribers-github-workflow

Author: Baranov Victor (vbvictor)

Changes

I'm trying to make pr-clang-format.yml job run natively on ci-ubuntu-24.04 container.
As it appears, It already has clang-format-21.1.0, python3.12 installed, but python3.12 needs venv to work properly, and Ubuntu asks for this package to be installed in the system to create venv.

FYI I hacked test-run with --break-system-dependencies and clang-format job runs a lot faster https://github.com/llvm/llvm-project/actions/runs/18064896361/job/51406365488#logs (skipping 1min long clang-format installation). Just don't look at "Initialize containers" taking 6min, it usually takes 15-20sec

---

Full diff: https://github.com/llvm/llvm-project/pull/161024.diff

1 Files Affected:

• (modified) .github/workflows/containers/github-action-ci/Dockerfile (+1)

diff --git a/.github/workflows/containers/github-action-ci/Dockerfile b/.github/workflows/containers/github-action-ci/Dockerfile
index 1d3f5f9c35d7f..dc0c9cabc7f01 100644
--- a/.github/workflows/containers/github-action-ci/Dockerfile
+++ b/.github/workflows/containers/github-action-ci/Dockerfile
@@ -62,6 +62,7 @@ RUN apt-get update && \
     # Having a symlink from python to python3 enables code sharing between
     # the Linux and Windows pipelines.
     python3-pip \
+    python3-venv \
     file \
     tzdata \
     python-is-python3 && \

[boomanaiden154]

LGTM.

I think we want to eventually move to separate containers for the clang-format/premerge/clang-tidy workflows to trim down on space (and preinstall necessary python dependencies), but this seems fine for now, especially since the premerge container already has clang-format/clang-tidy.