install_arch: download the latest bootstrap image

playbooks/tasks/install_arch.yml

@@ -9,5 +9,5 @@
   roles:
     - install_arch
   vars:
-    - bootstrap_version: "2022.03.01"
+    - bootstrap_version: "latest"
     - sshd_enable_includes: false

roles/install_arch/tasks/main.yml

@@ -42,6 +42,11 @@
 - name: touch LOCK file on mountpoint
   file: path=/mnt/LOCK state=touch owner=root group=root mode=0644
 
+- name: fetch latest bootstrap version
+  set_fact:
+    bootstrap_version: "{{ lookup('url', 'https://geo.mirror.pkgbuild.com/iso/latest/arch/version') }}"
+  when: bootstrap_version == 'latest'
+
 - name: download bootstrap image
   get_url:
     url: https://geo.mirror.pkgbuild.com/iso/{{ bootstrap_version }}/archlinux-bootstrap-{{ bootstrap_version }}-x86_64.tar.gz