First release

.drone.yml

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+---
+kind: pipeline
+type: kubernetes
+name: default
+
+steps:
+  - name: lint
+    image: quay.io/adrilinux/ansible:latest
+    commands:
+      - ansible-lint ./
+#      - "find . -maxdepth 1 -name '*.yml' | sort | grep -v '.drone.yml' | xargs ansible-playbook --syntax-check --list-tasks"
+#      - "find . -maxdepth 1 -name '*.yml' | sort | grep -v '.drone.yml' | xargs ansible-lint"

defaults/main.yml

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+---
+lego_base_url: "https://github.com/go-acme/lego"
+lego_dl_url: "{{ lego_base_url }}/releases/download"
+lego_file: "lego_v{{ lego_ver.stdout }}_{{ ansible_system | lower }}_{{ ansible_machine | regex_replace('x86_64','amd64') }}.tar.gz"

meta/main.yml

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+galaxy_info:
+  author: Adrien Reslinger
+  description: Install Lego
+  company: Personnal
+  min_ansible_version: 2.9
+  galaxy_tags: []
+  license: GPL2
+  platforms:
+  - name: CentOS
+    version:
+    - 7
+    - 8
+  - name: RedHat
+    version:
+    - 7
+    - 8

tasks/main.yml

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+---
+- name: Install lego
+  tags:
+    - lego
+  block:
+  - name: Check if lego is already installed
+    stat:
+      path: /usr/local/bin/lego
+    register: lego
+    check_mode: no
+
+  - name: Check local version installed
+    shell: set -o pipefail && lego --version | sed 's|lego version \([^ ,+]*\).*|\1|'
+    register: lego_locver
+    changed_when: false
+    check_mode: no
+    when:
+      - lego.stat.exists
+
+  - name: Check online version
+    shell: set -o pipefail && curl -s {{ lego_base_url }}/releases/latest | sed 's|.*tag/v\(.*\)".*|\1|'
+    register: lego_ver
+    changed_when: false
+    check_mode: no
+
+  - name: Make lego temporary directory
+    file:
+      path: /tmp/lego_install
+      state: directory
+
+  - name: Download lego
+    block:
+    - name: Retreive lego archive file and extract it to temporary directory
+      ansible.builtin.unarchive:
+        src: "{{ lego_dl_url }}/v{{ lego_ver.stdout }}/{{ lego_file }}"
+        dest: /tmp/lego_install
+        remote_src: yes
+
+    - name: Install lego binary from temporary directory
+      ansible.builtin.copy:
+        src: /tmp/lego_install/lego
+        dest: /usr/local/bin/lego
+        owner: root
+        group: root
+        mode: u=rwx,g=rx,o=rx
+        remote_src: yes
+
+  - name: Remove lego temporary directory
+    file:
+      path: /tmp/lego_install
+      state: absent
+
+    when:
+      - not lego.stat.exists or ( lego_locver.stdout != lego_ver.stdout )