fix: ensure docker group exists before usermod

Author: noeljackson

base/Dockerfile

@@ -34,6 +34,7 @@ ENV LANG=en_US.UTF-8
 
 RUN useradd coder --create-home --shell=/bin/bash --uid=1000 --user-group && \
     echo "coder ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers.d/nopasswd && \
+    groupadd -f docker && \
     usermod -aG docker coder
 
 USER coder