feat: initial cross-distro package management role

Supports apt, dnf, yum, pacman, apk and zypper. Variables cover install,
remove, upgrade, cache refresh and autoremove.

tasks/main.yml

@@ -0,0 +1,9 @@
+---
+- name: Assert supported package manager
+  ansible.builtin.assert:
+    that:
+      - ansible_pkg_mgr in ['apt', 'dnf', 'yum', 'pacman', 'apk', 'zypper']
+    fail_msg: "Package manager '{{ ansible_pkg_mgr }}' is not supported by this role"
+
+- name: Include package manager tasks
+  ansible.builtin.include_tasks: "{{ ansible_pkg_mgr }}.yml"