Show Maven stack traces on errors in GH CI
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index b34a48c..9f468f6 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -50,4 +50,4 @@
         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