ci: use relative test scripts location

Author: plexoos

.github/workflows/build-pull-request.yaml

@@ -74,5 +74,5 @@ jobs:
       - name: Run tests
         if: ${{ matrix.target == 'develop' }}
         run: |
-          docker run --rm ${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }} /src/eic-opticks/tests/test_opticks.sh
-          docker run --rm ${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }} /src/eic-opticks/tests/test_simg4ox.sh
+          docker run --rm ${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }} tests/test_opticks.sh
+          docker run --rm ${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }} tests/test_simg4ox.sh