add pull request workflow

.github/workflows/on-pull-request.yml

@@ -0,0 +1,11 @@
+name: On Pull Request Opened
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    name: Stability Tests
+    uses: ./.github/workflows/run-tests.yml

.github/workflows/run-tests.yml

@@ -0,0 +1,21 @@
+name: Run Tests
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+     - uses: actions/checkout@v3
+     - name: Set up JDK 11
+       uses: actions/setup-java@v3
+       with:
+         java-version: '11'
+         distribution: 'temurin'
+         server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
+         settings-path: ${{ github.workspace }} # location for the settings.xml file
+
+     - name: Run Tests
+       run: ./gradlew :create-plugin:test