ci: create pr-tests.yml and remove pull_request event from tests.yml

.github/workflows/pr-tests.yml

@@ -0,0 +1,24 @@
+name: "Test the PR"
+on:
+  pull_request:
+    branches:
+      - main
+jobs:
+  run_test:
+    name: "Run tests"
+    runs-on: ubuntu-latest
+
+    strategy:
+      max-parallel: 1
+      matrix:
+        node-version: [18.x, 20.x]
+        # See supported Node.js release schedule at https://nodejs.org/en/about/releases
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install modules
+      run: npm ci
+    - name: Run unit tests
+      run: npm run test
+    - name: Build
+      run: npm run build

.github/workflows/tests.yml

@@ -6,9 +6,6 @@ on:
   push:
     branches:
       - main
-  pull_request:
-    branches:
-      - main
 jobs:
   run_test:
     name: "Run tests"