enable ipv6 on Alpine Linux

[skyfaller]

Broken code:

linode-caddy/roles/new-linode_create/tasks/main.yml

Lines 109 to 115 in 30b9d7f

	- name: Add the server's ipv6 address to local /etc/hosts file
	lineinfile:
	dest: /etc/hosts
	regexp: "^\\S+:\\S+\\s+{{ linode_label }}$"
	line: "{{ created_linode.instance.ipv6.split('/')[0] | lower }}\t{{ linode_label }}"
	state: present
	become: true

Only the IPv4 address seems to be in my /etc/hosts ?

[skyfaller]

It's possible that this is an Alpine Linux issue, and that IPv6 is not enabled by default: https://wiki.alpinelinux.org/wiki/Configure_Networking#Enabling_IPv6_.28Optional.29

EDIT: Confirmed, cannot ping Alpine Linux on IPv6. So the problem is how to enable IPv6.