bitbake: toaster: fix pytest build test execution and test discovery

Ensure the proper django settings are used by moving the variable to
the environment assignment.
Remove python file specifier as this works relative to the working
directory, which can vary. The test file directory can instead be
specified when executing the pytest command.
Add annotations required to allow database access with pytest to the
build tests.

(Bitbake rev: 7f4dfaa5bd28ccf1ae0122d984ffa7e02e693960)

Signed-off-by: Alexander Lussier-Cullen <alexander.lussier-cullen@savoirfairelinux.com>
CC: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/pytest.ini

@@ -1,9 +1,5 @@
 # -- FILE: pytest.ini (or tox.ini)
 [pytest]
-DJANGO_SETTINGS_MODULE = toastermain.settings_test
-
-python_files = db/test_*.py commands/test_*.py views/test_*.py browser/test_*.py functional/test_*.py
-
 # --create-db - force re creation of the test database
 # https://pytest-django.readthedocs.io/en/latest/database.html#create-db-force-re-creation-of-the-test-database
 
@@ -17,3 +13,4 @@ addopts = --create-db --html="Toaster Tests Report.html" --self-contained-html
 # https://pypi.org/project/pytest-env/
 env =
     TOASTER_BUILDSERVER=1
+    DJANGO_SETTINGS_MODULE=toastermain.settings_test

bitbake/lib/toaster/tests/builds/test_core_image_min.py

@@ -10,6 +10,7 @@
 # Ionut Chisanovici, Paul Eggleton and Cristian Iorga
 
 import os
+import pytest
 
 from django.db.models import Q
 
@@ -21,6 +22,7 @@ from orm.models import CustomImagePackage
 from tests.builds.buildtest import BuildTest
 
 
+@pytest.mark.django_db(True)
 class BuildCoreImageMinimal(BuildTest):
     """Build core-image-minimal and test the results"""