build: run github actions on pull requests (#27786)

.github/workflows/ci-static-analysis.yml

@@ -0,0 +1,43 @@
+name: CI
+
+on: pull_request
+
+jobs:
+  tests:
+    name: Static analysis
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: ['3.8']
+        os: ['ubuntu-20.04']
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install system requirements
+        run: sudo apt update && sudo apt install -y libxmlsec1-dev
+
+      - name: Install pip
+        run: python -m pip install -r requirements/pip.txt
+
+      - name: Get pip cache dir
+        id: pip-cache-dir
+        run: echo "::set-output name=dir::$(pip cache dir)"
+
+      - name: Cache pip dependencies
+        id: cache-dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.pip-cache-dir.outputs.dir }}
+          key: ${{ runner.os }}-pip-${{ hashFiles('requirements/edx/development.txt') }}
+          restore-keys: ${{ runner.os }}-pip-
+
+      - name: Install python dependencies
+        run: pip install -r requirements/edx/development.txt
+
+      - name: Static code analysis
+        run: make check-types

openedx/core/djangoapps/content/learning_sequences/views.py

@@ -16,7 +16,9 @@ from rest_framework.exceptions import NotFound, PermissionDenied
 from rest_framework.response import Response
 from rest_framework.views import APIView
 
+from openedx.core import types
 from openedx.core.lib.api.view_utils import validate_course_key
+
 from .api import get_user_course_outline_details
 from .api.permissions import can_call_public_api, can_see_content_as_other_users
 from .data import CourseOutlineData
@@ -185,7 +187,7 @@ class CourseOutlineView(APIView):
         serializer = self.UserCourseOutlineDataSerializer(user_course_outline_details)
         return Response(serializer.data)
 
-    def _determine_user(self, request, course_key: CourseKey) -> User:
+    def _determine_user(self, request, course_key: CourseKey) -> types.User:
         """
         For which user should we get an outline?