Show Maven stack traces on errors in GH CI

Author: garydgregory

.github/workflows/maven.yml

@@ -76,7 +76,7 @@ jobs:
         server-username: NEXUS_USER # env variable for username in deploy
         server-password: NEXUS_PW # env variable for token in deploy
     - name: Build with Maven
-      run: mvn --show-version --batch-mode --no-transfer-progress -DtrimStackTrace=false
+      run: mvn --errors --show-version --batch-mode --no-transfer-progress -DtrimStackTrace=false
     - name: Deploy SNAPSHOT using minimal build
       if: matrix.deploy && github.repository == 'apache/commons-io' && github.ref_name == 'master' 
       env: