Add lockfile check

.github/workflows/budibase_ci.yml

@@ -309,3 +309,20 @@ jobs:
             } else {
               console.log('All good, the submodule had been merged and setup correctly!')
             }
+
+  check-lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          submodules: ${{ env.IS_OSS_CONTRIBUTOR == 'false' }}
+          token: ${{ secrets.PERSONAL_ACCESS_TOKEN || github.token }}
+
+      - name: Use Node.js 20.x
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+          cache: yarn
+      - run: yarn --frozen-lockfile
+      - run: yarn --production --frozen-lockfile