Add script to upgrade dungeondraft after install

.local/bin/installzip

@@ -0,0 +1,33 @@
+#! /bin/bash
+
+zip=$1
+
+dir=$(mktemp -d)
+
+unzip -qq $zip -d $dir
+
+file_count=$(ls "$dir" | wc -l)
+if [ $file_count = "1" ] && [ -d $(ls -d $dir/*) ]; then
+    dir="$dir/$(ls "$dir")"
+fi
+
+for file in $(ls "$dir"); do
+    if [[ $file =~ \.x86_64 ]]; then
+        chmod +x "$dir/$file"
+    fi
+    if [ -x "$dir/$file" ] && [ -f "$dir/$file" ]; then
+        exe_name="$file"
+        break
+    fi
+done
+
+if [ -n $exe_name ]; then
+    basename="${exe_name%.*}"
+    dest="/opt/$basename"
+    [ -d $dest ] && doas rm -rf "$dest"
+    doas mv -f "$dir" "$dest"
+    doas chmod 755 "$dest"
+    exe=$(echo "$basename" | tr '[:upper:]' '[:lower:]')
+    doas ln -fs "$dest/$exe_name" "/usr/bin/$exe"
+fi
+