Laravel-excelのインストールに失敗

# 概要
Laravel-Excelのインストールに失敗したので、解決策を記載する。


# 実行環境
- docker-compose : 1.24.1
- laravel-excel 3.1.17

### 実行環境を作ったときの参考
- [Laravelの環境をDockerで構築するチュートリアル](https://tech.windii.jp/backend/laravel/laravel-with-docker-compose) 
- [Laravelの環境をDockerで構築する【PHP:7.1 + Nginx + MySQL:5.7】](https://tanaken.me/web/199/)


# エラー
`$ composer require maatwebsite/excel`

>Do not run Composer as root/super user! See https://getcomposer.org/root for details Using version ^3.1 for maatwebsite/excel
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

 > Problem 1
    - maatwebsite/excel 3.1.10 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.11 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.12 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.13 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.14 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.15 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.16 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.17 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.7 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.8 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.9 requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.x-dev requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.2.x-dev requires phpoffice/phpspreadsheet ^1.6 -> satisfiable by phpoffice/phpspreadsheet[1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.0 requires phpoffice/phpspreadsheet ^1.4 -> satisfiable by phpoffice/phpspreadsheet[1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.1 requires phpoffice/phpspreadsheet ^1.4 -> satisfiable by phpoffice/phpspreadsheet[1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.2 requires phpoffice/phpspreadsheet ^1.4 -> satisfiable by phpoffice/phpspreadsheet[1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.3 requires phpoffice/phpspreadsheet ^1.4 -> satisfiable by phpoffice/phpspreadsheet[1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.4 requires phpoffice/phpspreadsheet ^1.4 -> satisfiable by phpoffice/phpspreadsheet[1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.5 requires phpoffice/phpspreadsheet ^1.4 -> satisfiable by phpoffice/phpspreadsheet[1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - maatwebsite/excel 3.1.6 requires phpoffice/phpspreadsheet ^1.4 -> satisfiable by phpoffice/phpspreadsheet[1.4.0, 1.4.1, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.7.0, 1.8.0, 1.8.1, 1.8.2, 1.9.0].
    - phpoffice/phpspreadsheet 1.9.0 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.8.2 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.8.1 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.8.0 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.7.0 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.6.0 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.5.2 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.5.1 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.5.0 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.4.1 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - phpoffice/phpspreadsheet 1.4.0 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - Installation request for maatwebsite/excel ^3.1 -> satisfiable by maatwebsite/excel[3.1.0, 3.1.1, 3.1.10, 3.1.11, 3.1.12, 3.1.13, 3.1.14, 3.1.15, 3.1.16, 3.1.17, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6, 3.1.7, 3.1.8, 3.1.9, 3.1.x-dev, 3.2.x-dev].

 > To enable extensions, verify that they are enabled in your .ini files:
    - /usr/local/etc/php/php.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-gd.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-pdo_mysql.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-pdo_pgsql.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-sodium.ini
    - /usr/local/etc/php/conf.d/laravel.ini
  You can also run php --ini inside terminal to see which files are used by PHP in CLI mode.

>Installation failed, reverting ./composer.json to its original content.

# 解決策
1. phpーfpmのDockerfileに以下を追記
   - `RUN apt-get update && apt-get install -y libzip-dev libpng-dev && docker-php-ext-install zip gd`
2. install
    - `composer require maatwebsite/excel`

### installの参考
- [Laravel-excel で帳票を出力する](https://qiita.com/ShibuyaKosuke/items/7e5e99c51546a578d97b)