try ssh executor - updated script

.gitlab-ci.yml

@@ -36,14 +36,13 @@ unit-test-job:   # This job runs in the test stage.
     - pwd
     - ls -a
     - ls /nfsdata/share/csst_simulation_data/Cycle-5-SimuData/multipleBandsImaging/NGP_AstrometryON_shearOFF
-    - which python3
-    - which pip3
-    - python3 --version
+    - which python
+    - which pip
+    - python --version
     - source /home/csstpipeline/anaconda3/bin/activate
-    - which python3
-    - which pip3
-    - python3 --version
+    - which python
+    - which pip
+    - python --version
     - pip install -r requirements.txt
     - sh install.sh
-    - export PATH=$HOME/.local/bin:$PATH
     - pytest