nextcloud: Deploy Nextcloud w/ Apache+PHP-FPM

The *nextcloud* role installs Nextcloud from the specified release
archive, downloading it to the control machine first if necessary, and
configures Apache and PHP-FPM to serve it.

The `nextcloud.yml` playbook uses the *cert* role to install the X.509
certificate for the Nextcloud server, sets up Apache HTTPD with the
*apache* role, and installs Nextcloud using the *nextcloud* role.

The host *cloud0.pyrocufflink.blue* is the Nextcloud server for
Pyrocufflink.

roles/nextcloud/vars/main.yml

@@ -0,0 +1,25 @@
+nextcloud_packages:
+- bzip2
+- ffmpeg
+- php
+- php-fpm
+- php-gd
+- php-gmp
+- php-intl
+- php-json
+- php-ldap
+- php-mbstring
+- php-opcache
+- php-pdo
+- php-pecl-apcu
+- php-pecl-imagick
+- php-pecl-zip
+- php-pgsql
+- php-process
+- php-smbclient
+- php-xml
+- python3-psycopg2
+- tar
+nextcloud_archive_name: nextcloud-{{ nextcloud_version }}.tar.bz2
+nextcloud_archive_url: >-
+ https://download.nextcloud.com/server/releases/{{ nextcloud_archive_name }}