enable running experiments as non-root in Dockerfile.min

docker/Dockerfile.min

 FROM simbricks/simbricks:latest as builder
 FROM simbricks/simbricks-runenv:latest
-COPY --from=builder /simbricks /simbricks
+# Add non-root user for vs code devcontainer.
+ARG USERNAME=simbricks
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+RUN groupadd --gid $USER_GID $USERNAME \
+ && useradd --uid $USER_UID --gid $USER_GID -m $USERNAME --shell /bin/bash \
+# Add sudo support for this user and remove the need to type in password.
+ && apt-get update \
+ && apt-get install -y sudo \
+ && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
+ && chmod 0440 /etc/sudoers.d/$USERNAME \
+COPY --chown=${USERNAME}:${USERNAME} --from=builder /simbricks /simbricks
 WORKDIR /simbricks