ci: add pytest config to backend dir for CI compatibility

backend/.coveragerc

@@ -0,0 +1,20 @@
+[run]
+source = backend/app
+omit = backend/tests/*,backend/app/ws/*,*/site-packages/*
+branch = True
+
+[report]
+show_missing = True
+fail_under = 90
+exclude_lines =
+    pragma: no cover
+    def __repr__
+    async def stream
+    async for chunk
+    async with client.stream
+    async with aiofiles
+    async def stream_radio
+    @router.websocket
+
+[html]
+directory = coverage_html

backend/pytest.ini

@@ -0,0 +1,8 @@
+[pytest]
+testpaths = tests
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+addopts = -v --tb=short --cov=app --cov-report=term-missing --cov-fail-under=90 -W ignore::ResourceWarning
+filterwarnings =
+    ignore::DeprecationWarning