remove empty deploy stage and separate build and test stages

.gitlab-ci.yml

@@ -1,6 +1,14 @@
 stages:
+  - build
   - test
-  - deploy
+
+build_pipeline:
+  image: condaforge/mambaforge:23.3.1-0
+  stage: build
+  script:
+    - mamba env create -f environment.yml --prefix conda_env/
+    - source /opt/conda/bin/activate conda_env/
+    - pip install .
 
 test_pipeline:
   image: condaforge/mambaforge:23.3.1-0
@@ -12,9 +20,3 @@ test_pipeline:
     - python -m unittest tests/tests.py
     - bash run_test.sh
 
-deploy-job:      # This job runs in the deploy stage.
-  stage: deploy  # It only runs when *both* jobs in the test stage complete successfully.
-  environment: production
-  script:
-    - echo "Deploying application..."
-    - echo "Application successfully deployed."