feat: add environment variable support for admin user creation in backend

.gitea/workflows/build.yaml

@@ -147,6 +147,10 @@ jobs:
             SEED_PIN=${{ secrets.SEED_PIN }}
             SEED_FIRST_NAME=${{ secrets.SEED_FIRST_NAME }}
             SEED_LAST_NAME=${{ secrets.SEED_LAST_NAME }}
+            ADMIN_EMAIL=${{ secrets.ADMIN_EMAIL }}
+            ADMIN_PASSWORD=${{ secrets.ADMIN_PASSWORD }}
+            ADMIN_FIRST_NAME=${{ secrets.ADMIN_FIRST_NAME }}
+            ADMIN_LAST_NAME=${{ secrets.ADMIN_LAST_NAME }}
             EOF
 
             echo "SECRET_KEY is set: $(grep -q 'SECRET_KEY=' .env && echo YES || echo NO)"
@@ -161,6 +165,8 @@ jobs:
             sleep 10
             echo "Seeding test user..."
             docker-compose -f docker-compose.test.yml exec -T chores-test-app-backend python scripts/seed_test_user.py
+            echo "Creating admin user..."
+            docker-compose -f docker-compose.test.yml exec -T chores-test-app-backend python scripts/create_admin.py
 
       - name: Send mail
         if: always() # Runs on success or failure