Revert "Remove pre-cached Docker images when preparing runner"

This reverts commit f468dc3.

See gh-42579

Author: wilkinsona

.github/actions/prepare-gradle-build/action.yml

@@ -30,6 +30,8 @@ runs:
     - name: Free Disk Space
       if: ${{ runner.os == 'Linux' }}
       uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be # v1.3.1
+      with:
+        docker-images: false
     - name: Set Up Java
       uses: actions/setup-java@v4
       with: