server/minecraft: Allowed auto detecting link for downloading server version

roles/server/minecraft/defaults/main.yml

@@ -11,7 +11,8 @@ data_directory: "{{ user_directory }}/data"
 remote_control_script: "{{ user_directory }}/cmd"
 
 # minecraft_version: "1.10" # for naming
-# minecraft_source_link: "https://mojang.example/server.jar" # direct link to server jar
+minecraft_source_link_generator: "curl --silent https://mcversions.net | grep minecraft_server-{{ minecraft_version }}.jar | grep --only-matching --perl-regexp '(?<=\")https://launcher.mojang.com/[^\"]+(?=\")'"
+minecraft_source_link: "{{ lookup('pipe', minecraft_source_link_generator) }}" # direct link to server jar
 minecraft_port: "25565"
 minecraft_rcon_port: "25575"
 minecraft_rcon_password: "{{ lookup('password', 'credentials/' + inventory_hostname + '/' + domain + '/rcon length=80') }}"