Default to non-root user

.devcontainer/Dockerfile

@@ -5,10 +5,15 @@
 
 FROM maven:3.6-jdk-8
 
+# Or your actual UID, GID on Linux if not the default 1000
+ARG USERNAME=vscode
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
 # Configure apt
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update \
-    && apt-get -y install --no-install-recommends apt-utils 2>&1 \
+    && apt-get -y install --no-install-recommends apt-utils dialog 2>&1 \
     #
     # Install git, process tools, lsb-release (common in install instructions for CLIs)
     && apt-get -y install git procps lsb-release \
@@ -16,9 +21,17 @@ RUN apt-get update \
     # Allow for a consistant java home location for settings - image is changing over time
     && if [ ! -d "/docker-java-home" ]; then ln -s "${JAVA_HOME}" /docker-java-home; fi \
     #
+    # Create a non-root user to use if preferred - see https://aka.ms/vscode-remote/containers/non-root-user.
+    && groupadd --gid $USER_GID $USERNAME \
+    && useradd -s /bin/bash --uid $USER_UID --gid $USER_GID -m $USERNAME \
+    # [Optional] Add sudo support for non-root user
+    && apt-get install -y sudo \
+    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
+    && chmod 0440 /etc/sudoers.d/$USERNAME \
+    #
     # Clean up
     && apt-get autoremove -y \
     && apt-get clean -y \
     && rm -rf /var/lib/apt/lists/*
 
-ENV DEBIAN_FRONTEND=dialog
+ENV DEBIAN_FRONTEND=

.devcontainer/devcontainer.json

@@ -8,5 +8,8 @@
 	"settings":{
 		"java.home": "/docker-java-home",
 		"terminal.integrated.shell.linux": "/bin/bash"
-	}
+	},
+	// Comment out the next line to run as root instead. Linux users, 
+	// update Dockerfile with your user's UID/GID if not 1000.
+	"runArgs": ["-u", "vscode"]
 }

README.md

@@ -10,7 +10,9 @@ Follow these steps to open this sample in a container:
 
 1. If this is your first time using a development container, please follow the [getting started steps](https://aka.ms/vscode-remote/containers/getting-started).
 
-2. If you're not yet in a development container:
+2. **Linux users:** Update `USER_UID` and `USER_GID` in `.devcontainer/Dockerfile` with your user UID/GID if not 1000 to avoid creating files as root.
+
+3. If you're not yet in a development container:
    - Clone this repository.
    - Press <kbd>F1</kbd> and select the **Remote-Containers: Open Folder in Container...** command.
    - Select the cloned copy of this folder, wait for the container to start, and try things out!
@@ -19,6 +21,8 @@ Follow these steps to open this sample in a container:
 
 Once you have this sample opened in a container, you'll be able to work with it like you would locally. 
 
+> **Note:** This container runs as a non-root user with sudo access by default. Comment out `"-u", "vscode"` in `.devcontainer/devcontainer.json` if you'd prefer to run as root.
+
 Some things to try:
 
 1. **Edit:**