refactor(bootstrap,configuration,environment): add defaults/main.yml and extract hardcoded values

roles/environment/tasks/_prepare_installer.yml

@@ -4,14 +4,14 @@
   ansible.builtin.lineinfile:
     path: /etc/pacman.conf
     regexp: ^#ParallelDownloads =
-    line: ParallelDownloads = 20
+    line: "ParallelDownloads = {{ environment_parallel_downloads }}"
 
 - name: Wait for pacman lock to be released
   when: not (custom_iso | bool)
   ansible.builtin.wait_for:
     path: /var/lib/pacman/db.lck
     state: absent
-    timeout: 120
+    timeout: "{{ environment_pacman_lock_timeout }}"
   changed_when: false
 
 - name: Setup Pacman
@@ -31,8 +31,8 @@
     - { name: ubuntu-keyring, os: [ubuntu, ubuntu-lts] }
   loop_control:
     label: "{{ item.name }}"
-  retries: 4
-  delay: 15
+  retries: "{{ environment_pacman_retries }}"
+  delay: "{{ environment_pacman_retry_delay }}"
 
 - name: Prepare /iso mount and repository for RHEL-based systems
   when: os == "rhel"