install_arch: use versionless bootstrap tarball

Since release 2022.07.01, there is a versionless bootstrap tarball file (archlinux-bootstrap-x86_64.tar.gz). See https://github.com/pierres/archiso-manager/pull/12.

"latest" is a valid version, so there is no need to check for the exact version number anymore.

roles/install_arch/tasks/main.yml

@@ -40,20 +40,15 @@
 - 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
+    url: https://geo.mirror.pkgbuild.com/iso/{{ bootstrap_version }}/archlinux-bootstrap-x86_64.tar.gz
     dest: /tmp/
     mode: 0644
 
 - name: extract boostrap image  # noqa 208
   unarchive:
-    src: /tmp/archlinux-bootstrap-{{ bootstrap_version }}-x86_64.tar.gz
+    src: /tmp/archlinux-bootstrap-x86_64.tar.gz
     dest: /tmp
     remote_src: true
     creates: /tmp/root.x86_64