Add workflow for building pull requests

Author: wilkinsona

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

@@ -0,0 +1,26 @@
+name: Build Pull Request
+on: pull_request
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build pull request
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'spring-projects/spring-boot' }}
+    steps:
+      - name: Set up JDK 8
+        uses: actions/setup-java@v3
+        with:
+          java-version: '8'
+          distribution: 'liberica'
+
+      - name: Set up Gradle
+        uses: gradle/gradle-build-action@749f47bda3e44aa060e82d7b3ef7e40d953bd629
+
+      - name: Build
+        env:
+          CI: 'true'
+          GRADLE_ENTERPRISE_URL: 'https://ge.spring.io'
+        run: ./gradlew -Dorg.gradle.internal.launcher.welcomeMessageEnabled=false --no-daemon --max-workers=4 --continue build