Use 7z instead of xorriso to extract the ISO file

metal/roles/pxe-server/tasks/main.yml

@@ -21,7 +21,7 @@
 
 - name: Extract the ISO
   command:
-    cmd: "xorriso -osirrox on -indev {{ iso.dest }} -extract / {{ role_path }}/build/mnt"
+    cmd: "7z x {{ iso.dest }} -o{{ role_path }}/build/mnt"
     creates: "{{ role_path }}/build/mnt/.treeinfo"
 
 - name: Extract bootloader

tools/Dockerfile

@@ -11,7 +11,6 @@ RUN yes | pacman --sync --refresh \
         docker-compose \
         git \
         kubectl \
-        libisoburn \
         make \
         p7zip \
         python \