ci: add multi-platform build matrix (JDK 8/x86_64 + JDK 17/aarch64)

Author: vividcoder

.github/workflows/pr-check.yml

@@ -67,16 +67,26 @@ jobs:
             }
 
   build:
-    name: Build
-    runs-on: ubuntu-latest
+    name: Build (JDK ${{ matrix.java }} / ${{ matrix.arch }})
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - java: '8'
+            runner: ubuntu-latest
+            arch: x86_64
+          - java: '17'
+            runner: ubuntu-24.04-arm
+            arch: aarch64
 
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up JDK 8
+      - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v4
         with:
-          java-version: '8'
+          java-version: ${{ matrix.java }}
           distribution: 'temurin'
 
       - name: Cache Gradle packages
@@ -85,8 +95,8 @@ jobs:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle', '**/gradle-wrapper.properties') }}
-          restore-keys: ${{ runner.os }}-gradle-
+          key: ${{ runner.os }}-${{ matrix.arch }}-gradle-${{ hashFiles('**/*.gradle', '**/gradle-wrapper.properties') }}
+          restore-keys: ${{ runner.os }}-${{ matrix.arch }}-gradle-
 
       - name: Build
         run: ./gradlew clean build -x test