Default to a non-root user

.devcontainer/Dockerfile

@@ -8,9 +8,16 @@ FROM node:10
 # Avoid warnings by switching to noninteractive
 ENV DEBIAN_FRONTEND=noninteractive
 
+# The node image comes with a base non-root 'node' user, so the alternate
+# user here is primarily for Linux scenarios where you need to match your local
+# user UID/GID. See https://aka.ms/vscode-remote/containers/non-root-user.
+ARG USERNAME=vscode
+ARG USER_UID=1001
+ARG USER_GID=$USER_UID
+
 # Configure apt and install packages
 RUN apt-get update \
-    && apt-get -y install --no-install-recommends apt-utils 2>&1 \ 
+    && apt-get -y install --no-install-recommends apt-utils dialog 2>&1 \ 
     #
     # Verify git and needed tools are installed
     && apt-get install -y git procps \
@@ -29,10 +36,19 @@ RUN apt-get update \
     # Install eslint globally
     && npm install -g eslint \
     #
+    # Create a non-root user to use if preferred - see https://aka.ms/vscode-remote/containers/non-root-user.
+    && if [ "$USER_GID" != "1000" ]; then groupadd --gid $USER_GID $USERNAME; fi \
+    && if [ "$USER_UID" != "1000" ]; then useradd -s /bin/bash --uid $USER_UID --gid $USER_GID -m $USERNAME; fi \
+    # [Optional] Add sudo support for non-root users
+    && apt-get install -y sudo \
+    && if [ "$USER_UID" != "1000" ]; then echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME; fi \
+    && echo node ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/node \
+    && chmod 0440 /etc/sudoers.d/$USERNAME \
+    #
     # Clean up
     && apt-get autoremove -y \
     && apt-get clean -y \
     && rm -rf /var/lib/apt/lists/*
 
 # Switch back to dialog for any ad-hoc use of apt-get
-ENV DEBIAN_FRONTEND=dialog
+ENV DEBIAN_FRONTEND=