diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
deleted file mode 100644
index 4353100..0000000
--- a/.github/workflows/build.yml
+++ /dev/null
@@ -1,20 +0,0 @@
-name: Build and test
-on: push
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Set up OpenJDK 8
-        uses: actions/setup-java@v2
-        with:
-          java-version: 8
-          distribution: "temurin"
-      - name: Test
-        env:
-          GCP_EMAIL: ${{secrets.GCP_EMAIL}}
-          GCP_JSON_KEYFILE: ${{secrets.GCP_JSON_KEYFILE}}
-          GCP_PRIVATE_KEYFILE: ${{secrets.GCP_PRIVATE_KEYFILE}}
-          GCP_BUCKET: ${{secrets.GCP_BUCKET}}
-          GCP_BUCKET_DIRECTORY: ${{secrets.GCP_BUCKET_DIRECTORY}}
-        run: ./gradlew --stacktrace test
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
new file mode 100644
index 0000000..4d5e789
--- /dev/null
+++ b/.github/workflows/check.yml
@@ -0,0 +1,33 @@
+name: Check
+on: [ pull_request, push ]
+jobs:
+  check:
+    runs-on: ${{ matrix.os }}
+    # push: always run.
+    # pull_request: run only when the PR is submitted from a forked repository, not within this repository.
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+        - ubuntu-latest
+        - macOS-13  # OpenJDK 8 is not supported on macos-14+ (M1).
+        # - windows-latest  # The tests are not ready for Windows.
+    steps:
+    - name: Set Git's core.autocrlf to false for Windows before checkout
+      run: git config --global core.autocrlf false
+    - uses: actions/checkout@v4
+    - name: Set up OpenJDK 8
+      uses: actions/setup-java@v4
+      with:
+        java-version: 8
+        distribution: "temurin"
+        cache: "gradle"
+    - name: Check
+      env:
+        GCP_EMAIL: ${{secrets.GCP_EMAIL}}
+        GCP_JSON_KEYFILE: ${{secrets.GCP_JSON_KEYFILE}}
+        GCP_PRIVATE_KEYFILE: ${{secrets.GCP_PRIVATE_KEYFILE}}
+        GCP_BUCKET: ${{secrets.GCP_BUCKET}}
+        GCP_BUCKET_DIRECTORY: ${{secrets.GCP_BUCKET_DIRECTORY}}
+      run: ./gradlew --stacktrace check