Improve devcontainer Dockerfile

.devcontainer/Dockerfile

@@ -4,15 +4,21 @@ USER root
 # Install dependencies
 COPY requirements-dev.txt /freqtrade/
 
+ARG USERNAME=ftuser
+
 RUN apt-get update \
     && apt-get -y install --no-install-recommends apt-utils dialog \
-    && apt-get -y install --no-install-recommends git sudo vim build-essential \
+    && apt-get -y install --no-install-recommends git sudo ssh vim build-essential \
     && apt-get clean \
-    && mkdir -p /home/ftuser/.vscode-server /home/ftuser/.vscode-server-insiders /home/ftuser/commandhistory \
-    && echo "export PROMPT_COMMAND='history -a'" >> /home/ftuser/.bashrc \
-    && echo "export HISTFILE=~/commandhistory/.bash_history" >> /home/ftuser/.bashrc \
-    && chown ftuser:ftuser -R /home/ftuser/.local/ \
-    && chown ftuser: -R /home/ftuser/
+    && mkdir -p /home/${USERNAME}/.vscode-server /home/${USERNAME}/.vscode-server-insiders /home/${USERNAME}/commandhistory \
+    # Add user to Suders
+    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
+    && chmod 0440 /etc/sudoers.d/$USERNAME \
+    # keep command history
+    && echo "export PROMPT_COMMAND='history -a'" >> /home/${USERNAME}/.bashrc \
+    && echo "export HISTFILE=~/commandhistory/.bash_history" >> /home/${USERNAME}/.bashrc \
+    && chown ${USERNAME}:${USERNAME} -R /home/${USERNAME}/.local/ \
+    && chown ${USERNAME}: -R /home/${USERNAME}/
 
 USER ftuser