Show Maven stack traces on errors in GH CI
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index bdf6b47..beb15a0 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -49,4 +49,4 @@
         distribution: 'temurin'

         java-version: ${{ matrix.java }}

     - name: Build with Maven

-      run: mvn --show-version --batch-mode --no-transfer-progress -Ddoclint=all

+      run: mvn --errors --show-version --batch-mode --no-transfer-progress -Ddoclint=all