added: installing docker-compose to run our backend tests

.github/workflows/ci-tests.yml

@@ -50,7 +50,13 @@ jobs:
       - name: Install dependencies
         working-directory: ./backend
         run: pip3 install -r requirements.txt && pip3 install -r dev-requirements.txt
-
+
+      - name: Install Docker Compose
+        run: |
+          sudo curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
+          sudo chmod +x /usr/local/bin/docker-compose
+          docker-compose --version
+      
       - name: Running tests
         working-directory: ./backend
         run: bash ./run_tests.sh