chore: enforce prettier, ignore submodules and vendor files (#3018)

* chore: enforce prettier, ignore submodules and vendor files

* chore: add format check in CI

---------

Co-authored-by: Huang Xin <chrox.huang@gmail.com>

.github/dependabot.yml

@@ -8,6 +8,6 @@ updates:
     groups:
       github-actions:
         patterns:
-          - "*"  # Group all Actions updates into a single larger pull request
+          - '*' # Group all Actions updates into a single larger pull request
     schedule:
       interval: weekly

.github/workflows/pull-request.yml

@@ -68,6 +68,10 @@ jobs:
         run: |
           pnpm install && pnpm setup-vendors
 
+      - name: run format check
+        run: |
+          pnpm format:check || (pnpm format && git diff && exit 1)
+
       - name: run tests
         working-directory: apps/readest-app
         run: |