iiab/roles/3-base-server

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3-base-server README
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This 3rd stage installs base server infra that Internet-in-a-Box requires, including:

- `MySQL <https://github.com/iiab/iiab/blob/master/roles/mysql>`_ (database underlying many/most user-facing apps).  This IIAB role also installs apt package:
   - **php{{ php_version }}-mysql** — which forcibly installs **php{{ php_version }}-common**
- `NGINX <https://github.com/iiab/iiab/blob/master/roles/nginx>`_ web server (with Apache in some lingering cases).  This IIAB role also installs apt package:
   - **php{{ php_version }}-fpm** — which forcibly installs **php{{ php_version }}-cli**, **php{{ php_version }}-common** and **libsodium23**
- `www_base <https://github.com/iiab/iiab/blob/master/roles/www_base>`_ (similar to `www_options <https://github.com/iiab/iiab/blob/master/roles/www_options>`_ which runs later in 4-server-options)

Recap: as with 2-common, 4-server-options and 5-xo-services: this 3rd stage installs core server infra, that is not user-facing.

The next stage (4-server-options) brings more diverse/optional server infra functionality.