feat: add support for WebdriverIO tests with pinned v12 (non-PRs)

Author: BenHenning

.github/workflows/test.yml

@@ -13,7 +13,8 @@ permissions:
   contents: read
 
 jobs:
-  build:
+  webdriverio_tests_tip_of_tree_v12:
+    name: WebdriverIO tests (against tip-of-tree core v12)
     timeout-minutes: 10
     runs-on: ${{ matrix.os }}
 
@@ -63,3 +64,30 @@ jobs:
         run: |
           cd main
           npm run test
+
+  webdriverio_tests:
+    name: WebdriverIO tests (against pinned v12)
+    # Don't run pinned version checks for PRs.
+    if: ${{ !github.base_ref }}
+    timeout-minutes: 10
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+
+    steps:
+      - name: Checkout experimentation plugin
+        uses: actions/checkout@v4
+
+      - name: Use Node.js 20.x
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+
+      - name: NPM install
+        run: npm install
+
+      - name: Run tests
+        run: npm run test