fix: drop outdated operating systems from CI (#117)

The nginxinc.nginx roles fails on Ubuntu 16.04 and Debian 9 with

  The repository 'https://nginx.org/packages/mainline/ubuntu xenial Release' does not have a Release file.

For the moment we're not dropping support officially yet; let's see first whether we can get rid of the nginxinc.nginx role in a follow-up pull request.

* install crontab to support Debian 11

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
 
     strategy:
       matrix:
-        distro: [ubuntu1604, ubuntu1804, ubuntu2004, debian9, debian10]
+        distro: [ubuntu1804, ubuntu2004, debian10, debian11]
       fail-fast: false
 
     steps:

README.md

@@ -25,20 +25,15 @@ Minimum Ansible Version: 2.2
 
 Supported Platforms
 
-- Ubuntu: trusty
-- Ubuntu: utopic
-- Ubuntu: vivid
-- Ubuntu: wily
 - Ubuntu: xenial
 - Ubuntu: yakkety
 - Ubuntu: zesty
 - Ubuntu: artful
 - Ubuntu: bionic
 - Ubuntu: focal
-- Debian: wheezy
-- Debian: jessie
 - Debian: stretch
 - Debian: buster
+- Debian: bullseye
 
 ## Dependencies
 

meta/main.yml

@@ -10,10 +10,6 @@ galaxy_info:
   platforms:
   - name: Ubuntu
     versions:
-    - trusty
-    - utopic
-    - vivid
-    - wily
     - xenial
     - yakkety
     - zesty
@@ -22,10 +18,9 @@ galaxy_info:
     - focal
   - name: Debian
     versions:
-    - wheezy
-    - jessie
     - stretch
     - buster
+    - bullseye
   galaxy_tags:
   - networking
   - packaging

tasks/main.yml

@@ -34,6 +34,7 @@
     name:
     - moreutils    # for plugin updates
     - rsync        # for dokku git:sync
+    - cron         # missing on debian11
   tags:
   - dokku-plugins