Migrate CI workflow to Develocity access key and setup-gradle

- GRADLE_ENTERPRISE_ACCESS_KEY → DEVELOCITY_ACCESS_KEY (matches
  the Develocity plugin rename in settings.gradle)
- Replace actions/cache + gradle/wrapper-validation-action with
  gradle/actions/setup-gradle, which handles both caching and
  wrapper validation

Author: ribafish

.github/workflows/ci.yml

@@ -27,16 +27,8 @@ jobs:
       matrix:
         java-version: [ 8.0.232 ]
     env:
-      GRADLE_ENTERPRISE_ACCESS_KEY: ${{ secrets.GE_ACCESS_TOKEN }}
+      DEVELOCITY_ACCESS_KEY: ${{ secrets.GE_ACCESS_TOKEN }}
     steps:
-      - name: Cache Gradle packages
-        uses: actions/cache@v2
-        with:
-          key: samza-ci-gradle-cache
-          path: |
-            ~/.gradle/caches
-            ~/.gradle/wrapper
-
       - uses: actions/checkout@v2
 
       - name: Set up JDK ${{ matrix.java-version }}
@@ -45,8 +37,8 @@ jobs:
           java-version: ${{ matrix.java-version }}
           distribution: 'zulu'
 
-      - name: Validate Gradle wrapper
-        uses: gradle/wrapper-validation-action@v1
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
 
       - name: Build with Gradle
         run: ./gradlew build