fix: build stage in CI

.gitlab-ci.yml

@@ -11,7 +11,8 @@ stages:          # List of stages for jobs, and their order of execution
 build-job:       # This job runs in the build stage, which runs first.
   stage: build
   script:
-    - pip install requirements.txt requirements-dev.txt
+    - pip install -r requirements.txt
+    - pip install -r requirements-dev.txt
     - pip install -e .
 
 unit-test-job:   # This job runs in the test stage.