Add gtsa

.github/workflows/tests.yml

@@ -32,6 +32,7 @@ jobs:
         conda activate goesenv
         pip install .
         pip install goespy@git+https://github.com/spestana/goes-py
+        pip install gtsa@git+https://github.com/friedrichknuth/gtsa
         mamba install pytest
     - name: Test with pytest
       run: |