Restore PR workflow

Author: snicoll

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

@@ -5,20 +5,19 @@ permissions:
 jobs:
   build:
     name: Build Pull Request
-    runs-on: ubuntu-latest
     if: ${{ github.repository == 'spring-gradle-plugins/nullability-plugin' }}
+    runs-on: ubuntu-latest
     steps:
+      - name: Check Out
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Set Up JDK 17
         uses: actions/setup-java@v4
         with:
           java-version: '17'
           distribution: 'liberica'
-      - name: Check Out
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Set Up Gradle
         uses: gradle/actions/setup-gradle@8379f6a1328ee0e06e2bb424dadb7b159856a326 # v4.4.0
       - name: Build
-        env:
         run: ./gradlew -Dorg.gradle.internal.launcher.welcomeMessageEnabled=false --no-daemon --no-parallel --continue build
       - name: Upload Build Reports
         uses: actions/upload-artifact@v4