diff --git a/.gitea/workflows/test-ci-runner.yml b/.gitea/workflows/test-ci-runner.yml
index 5f2ad08..488f81f 100644
--- a/.gitea/workflows/test-ci-runner.yml
+++ b/.gitea/workflows/test-ci-runner.yml
@@ -12,11 +12,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install JDK (JRE-only image)
-        uses: actions/setup-java@v4
-        with:
-          java-version: 17
-          distribution: temurin
+      - name: Install JDK (musl-native, Alpine package)
+        run: |
+          apk add --no-cache openjdk17-jdk
+          echo "JAVA_HOME=/usr/lib/jvm/java-17-openjdk" >> "$GITHUB_ENV"
 
       - name: Verify tools
         run: |