Add IzPack 5 setup to Ant CI and remove obsolete izpack.yml workflow

Author: eyedeekay

.github/workflows/ant.yml

@@ -23,6 +23,10 @@ jobs:
         with:
           java-version: '17'
           distribution: 'temurin'
+      - name: Set up IzPack 5
+        run: |
+          wget -O izpack-installer.jar https://repo1.maven.org/maven2/org/codehaus/izpack/izpack-dist/5.2.4/izpack-dist-5.2.4-installer.jar
+          java -jar izpack-installer.jar -options .github/workflows/auto-install.xml
       - name : Generate override.properties
         run: |
           rm -f override.properties

.github/workflows/auto-install.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!--
+    IzPack 5 unattended installation options file.
+    Used in GitHub Actions to install IzPack 5 non-interactively.
+
+    Usage:
+        java -jar izpack-dist-5.2.4-installer.jar -options .github/workflows/auto-install.xml
+
+    $USER_HOME resolves to the runner's home directory (~), so IzPack will be installed
+    at ~/IzPack, which matches the default izpack5.home value in build.properties.
+-->
+<AutoInstall>
+    <langpack code="eng"/>
+    <installpath>$USER_HOME/IzPack</installpath>
+</AutoInstall>