feat(oci): add user-ubuntu with nix user install

oci/user-ubuntu/Containerfile

@@ -0,0 +1,27 @@
+FROM ubuntu
+
+ARG USERNAME=user
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+# Create the user
+RUN groupadd --gid $USER_GID $USERNAME \
+    && useradd --uid $USER_UID --gid $USER_GID -m $USERNAME \
+    #
+    # [Optional] Add sudo support. Omit if you don't need to install software after connecting.
+    && apt-get update \
+    && apt-get install -y sudo \
+    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
+    && chmod 0440 /etc/sudoers.d/$USERNAME
+
+# ********************************************************
+# * Anything else you want to do like clean up goes here *
+# ********************************************************
+
+# [Optional] Set the default user. Omit if you want to keep the default as root.
+USER $USERNAME
+
+
+ENV DEBIAN_FRONTEND=noninteractive
+RUN sudo apt install -y curl xz-utils
+RUN curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s - install --init none --no-confirm