Add llvm role

roles/llvm/tasks/Debian-unstable.yaml

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+---
+- name: install apt packages
+  become: true
+  apt:
+    name:
+      - clang
+      - clang-format
+      - clang-tidy
+      - clang-tools
+      - clangd
+      - llvm
+    state: latest
+    install_recommends: true

roles/llvm/tasks/Debian.yaml

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+---
+- include_tasks: '{{ansible_distribution}}-{{ansible_distribution_version}}.yaml'

roles/llvm/tasks/Ubuntu-18.04.yaml

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+---
+- name: get list of releases from github
+  uri:
+    url: https://api.github.com/repos/llvm/llvm-project/releases
+  register: releases
+
+- name: select latest release with Ubuntu binaries
+  set_fact:
+    release: '{{releases.json | json_query("[?assets | [?contains(name, `x86_64-linux-gnu-ubuntu`)]] | [0]")}}'
+
+- name: select assets from latest release
+  set_fact:
+    asset: '{{release | json_query("assets | [?contains(name, `x86_64-linux-gnu-ubuntu`)] | [?ends_with(name, `.tar.xz`)] | [0]")}}'
+
+# - debug:
+#     msg: '{{asset.browser_download_url}}'
+
+- name: process release name for /usr/local/{{lib_dir}}
+  set_fact:
+    lib_dir: '{{release.name | lower | regex_replace(" (\d+)\.\d+\.\d+", "-\1")}}'
+
+- name: create temporary directory for download
+  tempfile:
+    state: directory
+  register: tempdir
+
+- set_fact:
+    download_path: '{{tempdir.path}}/llvm.tar.xz'
+
+- name: download release archive
+  get_url:
+    url: '{{asset.browser_download_url}}'
+    dest: '{{download_path}}'

roles/llvm/tasks/main.yaml

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+---
+- include_tasks: '{{ansible_os_family}}.yaml'