Fix Gazebo Garden base image

Signed-off-by: Michel Hidalgo <[email protected]>

docker/base/Dockerfile

@@ -49,10 +49,10 @@ RUN sudo /bin/sh -c 'echo "deb [arch=amd64,arm64] http://repo.ros2.org/ubuntu/ma
 USER $USERNAME
 
 # Check out Ignition source
-ENV IGN_WS /home/$USERNAME/ign_ws
-COPY docker/base/gz-garden.yaml ${IGN_WS}/gz-garden.yaml
-RUN mkdir -p ${IGN_WS}/src && cd ${IGN_WS} \ 
- && vcs import src < gz-garden.yaml
+ENV GZ_WS /home/$USERNAME/gz_ws
+COPY docker/base/gz-garden.yaml ${GZ_WS}/gz-garden.yaml
+RUN mkdir -p ${GZ_WS}/src && cd ${GZ_WS} && \
+ vcs import src < gz-garden.yaml && vcs pull src
 
 USER root
 
@@ -76,5 +76,5 @@ RUN rm -rf /var/lib/apt/lists/* \
 
 USER $USERNAME
 
-RUN cd ${IGN_WS} \
+RUN cd ${GZ_WS} \
  && colcon build --merge-install --cmake-args -DBUILD_TESTING=OFF