Update github ci

.github/workflows/ci.yml

@@ -1,22 +1,18 @@
 name: CI
 
-on:
-  pull_request:
-  push:
-    branches:
-      - main
+on: [push]
 
 jobs:
   verify:
     runs-on: ubuntu-latest
     if: github.event_name == 'pull_request'
     steps:
-      - uses: actions/checkout@v4
-      - name: Set up JDK 17
-        uses: actions/setup-java@v4
+      - uses: actions/checkout@v5
+      - uses: actions/setup-java@v4
         with:
-          java-version: '17'
           distribution: 'temurin'
+          java-version: '21'
+          cache: 'gradle'
       - name: Build with Gradle
         run: ./gradlew build
 
@@ -24,18 +20,20 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     steps:
-      - uses: actions/checkout@v4
-      - name: Set up JDK 17
-        uses: actions/setup-java@v4
+      - uses: actions/checkout@v5
+      - uses: actions/setup-java@v4
         with:
-          java-version: '17'
           distribution: 'temurin'
+          java-version: '21'
+          cache: 'gradle'
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
-          username: ${{ github.repository_owner }}
+          username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build with Gradle
+        run: ./gradlew build
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with: