fix cwd

Author: khvn26

.github/workflows/api-pull-request.yml

@@ -70,7 +70,7 @@ jobs:
         uses: liskin/gh-problem-matcher-wrap@v2
         with: 
           linters: mypy
-          run: make typecheck
+          run: cd api && make typecheck
 
       - name: Check autogenerated documentation
         uses: nickcharlton/diff-check@v1.0.0