Add PR validation workflows

.github/workflows/gradle-wrapper-validation.yml

@@ -0,0 +1,10 @@
+name: "Validate Gradle Wrapper"
+on: [push, pull_request]
+
+jobs:
+  validation:
+    name: "Validation"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: gradle/wrapper-validation-action@v2

.github/workflows/verify.yml

@@ -0,0 +1,29 @@
+name: 'Verify'
+
+on:
+  push:
+    branches-ignore:
+      - gh-pages
+  pull_request:
+    branches:
+      - '*'
+
+jobs:
+  build-and-verify:
+    runs-on: 'ubuntu-latest'
+    steps:
+      - uses: actions/checkout@v4
+      - name: 'Set up JDK 8'
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 8
+      - name: 'Set up JDK 21'
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 21
+      - name: 'Build'
+        uses: gradle/gradle-build-action@v3
+        with:
+          arguments: "build"