Merge pull request #37 from react-bootstrap/ci/add_sass_demo_testing

ci(actions): add sass testing suite to the ci testing matrix

Author: bpas247

.github/workflows/test-examples.yml

@@ -1,12 +1,12 @@
 name: Test Examples
-on: [push]
+on: [push, pull_request]
 jobs:
   test-example:
     name: Test Example
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        dir: [basic, basic-cdn, basic-ts]
+        dir: [basic, basic-cdn, basic-ts, basic-sass-custom-theming]
     steps:
       - name: Checking out Repository
         uses: actions/checkout@v1