[libc++][CI] Installs tzdata package in Docker.

[mordante]

This allows testing the time zone information in the CI. This is needed to let #82108 pass the CI.

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Mark de Wever (mordante)

Changes

This allows testing the time zone information in the CI. This is needed to let #82108 pass the CI.

---

Full diff: https://github.com/llvm/llvm-project/pull/84643.diff

1 Files Affected:

• (modified) libcxx/utils/ci/Dockerfile (+6)

diff --git a/libcxx/utils/ci/Dockerfile b/libcxx/utils/ci/Dockerfile
index 225de937cc869a..178cba41593388 100644
--- a/libcxx/utils/ci/Dockerfile
+++ b/libcxx/utils/ci/Dockerfile
@@ -65,6 +65,12 @@ RUN <<EOF
   echo "ALL ALL = (ALL) NOPASSWD: ALL" | tee /etc/sudoers || true
 EOF
 
+# Installing tzdata before other packages avoids the time zone prompts.
+# These prompts seem to ignore DEBIAN_FRONTEND=noninteractive.
+RUN sudo apt-get update \
+    && sudo apt-get install -y \
+        tzdata
+
 RUN sudo apt-get update \
     && sudo apt-get install -y \
         python3 \