vscode/Dockerfile: Add sudo, leave /tmp alone

vscode/Dockerfile

@@ -1,6 +1,6 @@
 FROM gitpod/workspace-full-vnc:latest
 
 # install dependencies
-RUN apt-get update \
-    && apt-get install -y libx11-dev libxkbfile-dev libsecret-1-dev libgconf2-dev libnss3 libgtk-3-dev libasound2-dev twm \
-    && apt-get clean && rm -rf /var/cache/apt/* && rm -rf /var/lib/apt/lists/* && rm -rf /tmp/*
+RUN sudo apt-get update \
+    && sudo apt-get install -y libx11-dev libxkbfile-dev libsecret-1-dev libgconf2-dev libnss3 libgtk-3-dev libasound2-dev twm \
+    && sudo apt-get clean && sudo rm -rf /var/cache/apt/* /var/lib/apt/lists/*