no idea if this will even work

roles/detect_archiso/tasks/main.yaml

@@ -0,0 +1,13 @@
+- name: check for archinstall in path
+  command: which archinstall
+  ignore_errors: true
+  register: which_archinstall
+
+- name: inspect archinstall result
+  set_fact:
+    archiso_detected: "{{ which_archinstall.rc == 0 }}"
+
+- name: override the inventory_hostname
+  set_fact:
+    inventory_hostname: "{{ hostname }}"
+  when: archiso_detected