chore: install coreutils

Author: Steffen911

.devcontainer/Dockerfile

@@ -1,5 +1,10 @@
 # Dev container Dockerfile
 FROM mcr.microsoft.com/devcontainers/python:3.12-bullseye
 
+# Install essential utilities including coreutils
+RUN apt-get update && apt-get install -y \
+    coreutils \
+    && rm -rf /var/lib/apt/lists/*
+
 # Install Poetry
 RUN curl -sSL https://install.python-poetry.org | python3 -