Added haskell user for use with vscode

Dockerfile

@@ -64,7 +64,16 @@ RUN \
     ghcup install hls
 
 ARG USER_NAME=haskell
-RUN useradd --no-log-init --create-home --shell /bin/bash ${USER_NAME}
-WORKDIR /home/${USER_NAME}
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
 
-USER ${USER_NAME}
+# Create the user
+RUN groupadd --gid $USER_GID $USER_NAME \
+    && useradd --uid $USER_UID --gid $USER_GID -m $USER_NAME \
+    #
+    # [Optional] Add sudo support. Omit if you don't need to install software after connecting.
+    && apt-get install -y sudo \
+    && echo $USER_NAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USER_NAME \
+    && chmod 0440 /etc/sudoers.d/$USER_NAME
+
+USER $USER_NAME