fix: remove previous images

Author: NikkiAsteinza

.github/workflows/main.yml

@@ -59,6 +59,7 @@ jobs:
       # Pull Unity image and Build project using Unity Builder
       - name: Build project
         run: |
+          docker rmi $(docker images -q)
           docker pull unityci/editor:ubuntu-2022.3.10f1-webgl-3.1.0
           docker run --rm \
             -v $GITHUB_WORKSPACE:/workspace \