Fix bootstrap OS detection — use /etc/os-release instead of ansible_os_family

roles/preflight/tasks/bootstrap.yml

@@ -1,18 +1,25 @@
 ---
-# Runs before gather_facts using raw commands — no Python required
 - name: Check if python3 is installed
   ansible.builtin.raw: which python3 || echo "missing"
   register: python_check
   changed_when: false
 
-- name: Install python3 on Alpine (raw — no Python needed)
+- name: Check OS type for bootstrap
+  ansible.builtin.raw: cat /etc/os-release | grep ^ID= | cut -d= -f2 | tr -d '"'
+  register: os_id
+  changed_when: false
+
+- name: Install python3 on Alpine
   ansible.builtin.raw: apk add --no-cache python3
-  when: "'missing' in python_check.stdout"
+  when: "'missing' in python_check.stdout and 'alpine' in os_id.stdout"
   changed_when: true
 
-- name: Install python3 on Debian/Ubuntu (raw — no Python needed)
+- name: Install python3 on Debian/Ubuntu
   ansible.builtin.raw: apt-get install -y python3
-  when:
-    - "'missing' in python_check.stdout"
-    - ansible_os_family is not defined or ansible_os_family == 'Debian'
+  when: "'missing' in python_check.stdout and ('debian' in os_id.stdout or 'ubuntu' in os_id.stdout)"
+  changed_when: true
+
+- name: Install python3 on RHEL/CentOS
+  ansible.builtin.raw: dnf install -y python3 || yum install -y python3
+  when: "'missing' in python_check.stdout and ('rhel' in os_id.stdout or 'centos' in os_id.stdout or 'fedora' in os_id.stdout)"
   changed_when: true