feat(snipe_it): add ansible role for deployment

roles/snipe_it/README.md

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+# `finallycoffee.services.snipe_it` ansible role
+
+[Snipe-IT](https://snipeitapp.com/) is an open-source asset management with
+a powerful JSON-REST API. This ansible role deploys and configures Snipe-IT.
+
+## Requirements
+
+Snipe-IT requires a MySQL-Database like MariaDB and a working email service
+for sending email. For installing and configuring MariaDB, see
+[`finallycoffee.base.mariadb`](https://galaxy.ansible.com/ui/repo/published/finallycoffee/base/content/role/mariadb/).
+
+## Configuration
+
+Required variables to set are:
+
+- `snipe_it_domain` - domain name of the snipe-it instance
+- `snipe_it_config_app_url` - URL where snipe-it will be reachable including protocol and port
+- `snipe_it_config_app_key` - Laravel application key
+
+### Database configuration
+
+All (database) options from the upstream laravel `.env` file are available
+under the `snipe_it_config_db_*` prefix. Configure a database as follows:
+```
+snipe_it_config_db_host: localhost # defaults to localhost
+snipe_it_config_db_port: "3306" # defaults to 3306
+snipe_it_config_db_database: my_snipe_db_name # defaults to 'snipeit'
+snipe_it_config_db_username: my_snipe_db_user # defaults to 'snipeit'
+snipe_it_config_db_password: my_snipe_db_password
+# Set this if the database is shared with
+# other applications. defaults to not set
+snipe_it_config_db_prefix: snipe_
+```
+
+### Email configuration
+
+Configuring an email server is mandatory. An example is provided below:
+```yaml
+snipe_it_config_mail_host: smtp.example.com
+snipe_it_config_mail_username: snipe_user@snipe.example.com
+snipe_it_config_mail_password: i_want_to_be_strong_and_long
+snipe_it_config_mail_from_addr: "noreply@snipe.example.com"
+snipe_it_config_mail_from_name: "Example.com SnipeIT instance"
+```
+
+The default smtp port is `587` and can be set in `snipe_it_config_mail_port`.