Setup unit test CI

[github-actions[bot]]

Description

Setup code unit test CI with pytest.

To do

• [x] Create the test workflow
• [x] Code a dummy test script

References

• Scilpy coding standards
• linum / linumpy / .gitlab-ci.yml
• pytest

Dependencies

• Depends on #32
• Depends on #19
• Depends on #34 closes #33

[github-actions[bot]]

This PR/issue depends on:

• benoit-dubreuil/inm5803-ete2022#32
• benoit-dubreuil/inm5803-ete2022#19
• benoit-dubreuil/inm5803-ete2022#34 By Dependent Issues (🤖). Happy coding!