Install xmlstarlet

Author: leonardehrenfried

.github/workflows/maven.yml

@@ -6,12 +6,20 @@ on:
   pull_request:
     branches: [ "master" ]
 
+env:
+  # Since version 3.9.0 of Maven it will automatically understand this environment variable.
+  # However, as of 2024-11 the latest versions of Ubuntu and Debian were on 3.8.8 so it will take some
+  # time until we can remove the $MAVEN_ARGS below.
+  MAVEN_ARGS: "--no-transfer-progress -Dstyle.color=always"
+
 jobs:
   build:
 
     runs-on: ubuntu-latest
 
     steps:
+    - run: |
+        apt-get install xmlstarlet -y
     - uses: actions/checkout@v4
     - name: Set up JDK 17
       uses: actions/setup-java@v4