disable codecov for pull requests

.github/workflows/CI.yml

@@ -13,13 +13,17 @@ jobs:
         java: [8, 11, 17]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up JDK ${{ matrix.java }}
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v4
         with:
+          distribution: 'zulu'
           java-version: ${{ matrix.java }}
 
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v3
+
       - name: Build
         run: |
           chmod +x gradlew
@@ -31,9 +35,11 @@ jobs:
         run: ./gradlew check --no-daemon
 
       - name: Build coverage report
+        if: github.ref == 'refs/heads/master' && github.event_name != 'pull_request'
         run: ./gradlew jacocoTestReport --no-daemon
 
       - uses: codecov/codecov-action@v4
+        if: github.ref == 'refs/heads/master' && github.event_name != 'pull_request'
         with:
           files: build/reports/jacoco/test/jacocoTestReport.xml
           flags: LINUX