👷 [#5102] Update CI job for upgrade simulations

Author: robinmolen

.github/workflows/ci.yml

@@ -472,7 +472,7 @@ jobs:
           docker compose run -e RELEASE=${RELEASE} web \
             python src/manage.py migrate
         env:
-          RELEASE: '3.1.0-dev.0'
+          RELEASE: '3.1.0-alpha.0'
           # ensure local image gets used
           TAG: ${{ needs.docker_build_setup.outputs.version }}