Simplify the test on Docker workflow

Signed-off-by: tdruez <[email protected]>

Author: tdruez

.github/workflows/run-unit-tests-docker.yml

@@ -5,6 +5,8 @@ on: [push, pull_request]
 jobs:
   build:
     runs-on: ubuntu-24.04
+    env:
+      FROM_DOCKER_IMAGE: "1"
 
     steps:
       - name: Checkout code
@@ -13,8 +15,5 @@ jobs:
       - name: Generate the .env file and the SECRET_KEY
         run: make envfile
 
-      - name: Build and run the Docker Compose stack
-        run: docker compose up -d
-
       - name: Run tests
-        run: docker compose run -e FROM_DOCKER_IMAGE=1 web python ./manage.py test --verbosity=2 --noinput
+        run: docker compose run web python ./manage.py test --verbosity=2 --noinput