chore(ci): add static type checking step (#583)

.github/workflows/backend-tests.yml

@@ -1,4 +1,4 @@
-name: Pytest
+name: Backend Tests
 
 on:
   push:
@@ -31,6 +31,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install pytest
+          pip install pyright
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       - name: Test with pytest
         env:
@@ -41,4 +42,8 @@ jobs:
           JWT_SECRET_KEY: ${{secrets.JWT_SECRET_KEY}}
           CI_TEST_API_KEY: ${{secrets.CI_TEST_API_KEY}} 
         run: |
-          pytest
+          pytest
+        
+      - name: Static type checking with pyright
+        run: |
+          pyright