Disable building space_robots image in Github Action (#237).

One of the the CI jobs fails to complete due to lack of space. This is
preventing us from complying with our process of always having a successful CI
build before merging PRs.

This commit disables the last stage of the docker build CI job, building the
`space_robots` image, where this problem manifests.

Author: ivanperez-keera

.github/workflows/docker-build.yml

@@ -42,11 +42,6 @@ jobs:
           build-args: |
             SPACE_ROS_IMAGE=osrf/space-ros:main
           outputs: type=docker,dest=/tmp/moveit2.tar
-      - name: Build space robots demo image
-        run: |
-          docker load --input /tmp/moveit2.tar
-          docker images
-          cd space_robots && ./build.sh
   space_nav2:
     runs-on: ubuntu-24.04
     steps: