Separate workflows between PRs and pushes (#3928)

* Separate workflows between PRs and pushes

* Fixup

.github/workflows/build-pr.yml

@@ -0,0 +1,23 @@
+name: Build PR
+
+on: [ pull_request ]
+
+jobs:
+  build_pr:
+    if: github.repository_owner == 'IntellectualSites'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, windows-latest, macos-latest ]
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v1
+      - name: Setup Java
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 17
+      - name: Clean Build
+        run: ./gradlew clean build