ci: fix Codecov on main (#3255)

* ci: skip nx cache for trunk tests

* ci: use more semantically correct conditional logic

Author: sh0ji

.github/workflows/test.yml

@@ -42,10 +42,10 @@ jobs:
         run: yarn build
       - name: Run test suite
         run: |
-          if [ "${{ github.event_name }}" == "pull_request" ]; then
-            npx nx affected --target=test --parallel=4 --ci --coverage --runInBand
+          if [ "${{ github.ref_name }}" == "main" ]; then
+            npx nx run-many --target=test --all --parallel=4 --ci --coverage --runInBand --skip-nx-cache
           else
-            npx nx run-many --target=test --all --parallel=4 --ci --coverage --runInBand
+            npx nx affected --target=test --parallel=4 --ci --coverage --runInBand
           fi
       - name: Upload test results
         uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0