ci: shard Cloudflare integration tests

Co-Authored-By: GPT-6 <codex@openai.com>

Author: nicohrubec

.github/workflows/build.yml

@@ -835,11 +835,15 @@ jobs:
         run: yarn test
 
   job_cloudflare_integration_tests:
-    name: Cloudflare Integration Tests
+    name: Cloudflare Integration Tests (${{ matrix.shard }}/2)
     needs: [job_get_metadata, job_build]
     if: needs.job_build.outputs.changed_cloudflare_integration == 'true' || github.event_name != 'pull_request'
     runs-on: ubuntu-24.04
     timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      matrix:
+        shard: [1, 2]
     steps:
       - name: Check out current commit (${{ needs.job_get_metadata.outputs.commit_label }})
         uses: actions/checkout@v7
@@ -856,7 +860,7 @@ jobs:
 
       - name: Run integration tests
         working-directory: dev-packages/cloudflare-integration-tests
-        run: yarn test
+        run: yarn test --shard=${{ matrix.shard }}/2
 
   job_bundler_plugin_integration_tests:
     name: Bundler Plugin Integration Tests (Node ${{ matrix.node }})