feat: add typecheck to pr build workflow (#202)

.github/workflows/pr.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
 
 jobs:
-  build: 
+  build:
     name: Build PR
     runs-on: ubuntu-latest
     steps:
@@ -38,6 +38,9 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-docusaurus-en-${{ hashFiles('**/yarn.lock') }}
 
+      - name: Typecheck
+        run: yarn typecheck
+
       - name: Build website
         run: yarn build --locale en
         env:
@@ -47,4 +50,4 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b
         with:
-          path: build
+          path: build