Use /etc/os-release to ID Ubuntu/Debian

Ansible facts aren't always enough to determine if a distro is derived
from Ubuntu or not, this is available from `/etc/os-release` when it
contains `ID_LIKE="ubuntu debian"`. This patch uses `/etc/os-release` to
correctly handle Ubuntu installations, e.g. PPA's, for all Ubuntu
derived dirtros rather than just Ubuntu itself.

roles/llvm/tasks/Debian.yaml

@@ -1,5 +1,17 @@
 ---
+- name: slurp /etc/os-release
+  slurp:
+    src: /etc/os-release
+  register: os_release_slurp
+- set_fact:
+    os_release: "{{ os_release_slurp.content |
+        b64decode | trim() | replace('=', ': ') | from_yaml }}"
+
+- include_tasks: Ubuntu.yaml
+  when: "'ID_LIKE' in os_release and os_release.ID_LIKE == 'ubuntu debian'"
+
 - name: install apt packages
+  when: "'ID_LIKE' not in os_release"
   become: true
   apt:
     name:

roles/llvm/tasks/Linux Mint.yaml

@@ -1,2 +0,0 @@
----
-- include_tasks: Ubuntu.yaml

roles/llvm/tasks/Pop!_OS.yaml

@@ -1,2 +0,0 @@
----
-- include_tasks: Ubuntu.yaml

roles/llvm/tasks/main.yaml

@@ -1,5 +1,2 @@
 ---
 - include_tasks: '{{ansible_os_family}}.yaml'
-  when: ansible_os_family in ['Darwin', 'Windows']
-- include_tasks: '{{ansible_distribution}}.yaml'
-  when: ansible_os_family not in ['Darwin', 'Windows']

roles/neovim/tasks/Debian.yaml

@@ -1,7 +1,14 @@
 ---
+- name: slurp /etc/os-release
+  slurp:
+    src: /etc/os-release
+  register: os_release_slurp
+- set_fact:
+    os_release: "{{ os_release_slurp.content |
+        b64decode | trim() | replace('=', ': ') | from_yaml }}"
+
 - name: add neovim stable ppa
-  when: ansible_distribution == 'Ubuntu' and
+  when: "'ID_LIKE' in os_release and os_release.ID_LIKE == 'ubuntu debian'"
-        ansible_distribution_version == '20.04'
   become: true
   apt_repository:
     repo: ppa:neovim-ppa/stable