docker image has a build user

Author: parmentelat

.github/docker/python-nodejs.Dockerfile

@@ -4,4 +4,14 @@ RUN true \
 && apt-get update \
 && apt-get install -y python3 python3-pip python3-venv \
 && apt-get install -y nodejs npm \
+&& apt-get install -y iproute2 \
 && true
+
+RUN useradd -m -s /bin/bash build && \
+    echo "build ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+
+WORKDIR /home/build/project
+RUN chown build:build /home/build
+
+# 4. Switch to the non-root user
+USER build