GH-1078: Allow JDK 25 CI jobs to fail gracefully

JDK 25 is early-access and Eclipse Temurin Docker images are not
yet available, causing the test matrix to fail. Mark JDK 25 jobs
with continue-on-error so they don't block the workflow.

Author: jbonofre

.github/workflows/test.yml

@@ -53,6 +53,8 @@ jobs:
             name: "Ubuntu"
           - image: conda-jni-cdata
             name: "Conda JNI"
+    # JDK 25 is early-access; Docker images may not be available yet
+    continue-on-error: ${{ matrix.jdk == 25 }}
     env:
       JDK: ${{ matrix.jdk }}
       MAVEN: ${{ matrix.maven }}