add spack post-installation testing

This Merge Request:

• adds or fixes tests for most EBRAINS (top-level) Spack packages
• adapts gitlab CI and installation script to run tests at installation time

packages/py-tvb-gdist/package.py

@@ -29,12 +29,11 @@ class PyTvbGdist(PythonPackage):
     depends_on('py-scipy', type=('build', 'run'))
     depends_on('py-cython', type=('build', 'run'))
 
-    depends_on('py-pytest', type='test')
-
     @run_after('install')
     @on_package_attributes(run_tests=True)
     def install_test(self):
+        # TODO tests are not packed on Pypi from tvb-gdist repo. We need ro do that or duplicate them here
+        with working_dir('spack-test', create=True):
+            python('-c', 'import gdist')
 
-        pytest = which('pytest')
-        pytest()