chore: import upstream snapshot with attribution

test-infrastructure/Dockerfile

@@ -0,0 +1,25 @@
+# Mirrors the Ubuntu CI environment exactly:
+#   - Ubuntu 24.04 (same as GitHub Actions ubuntu-latest / ubuntu-24.04-arm)
+#   - GCC (system default) with ASan + UBSan + LeakSanitizer
+#   - libsqlite3-dev + zlib1g-dev (same as CI "Install deps" step)
+#
+# Build:  docker build -t cbm-test test-infrastructure/
+# Run:    docker run --rm -v $(pwd):/src cbm-test
+
+FROM ubuntu:noble
+
+# Minimal: gcc + zlib only. sqlite3 is vendored (compiled from source with ASan).
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc g++ make \
+    zlib1g-dev \
+    pkg-config \
+    python3 \
+    git \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /src
+
+# Default: run test.sh with GCC (mirrors CI exactly)
+ENTRYPOINT ["scripts/test.sh"]
+CMD ["CC=gcc", "CXX=g++"]