Phpinspectionsea: Dockerfile can't be build properly

[filipe96]

| Subject | Details |
| :------------- | :---------------------------------------------------------------------------- |
| Issue type | Docker build failed |
| Plugin |not important for the bug|
| Language level | not important for the bug |

Current behaviour (description/screenshot:)
~~
---> Running in 790c6a73038d
The command '/bin/sh -c cd root; mkdir -p .PhpStorm${PHPSTORMVERSION}/config .PhpStorm${PHPSTORMVERSION}/system /var/ci/project && wget --quiet --no-verbose https://download.jetbrains.com/webide/PhpStorm-${PHPSTORMDOWNLOAD}.tar.gz && tar -xf PhpStorm-.tar.gz && cd PhpStorm-/plugins && ls | grep -Evi "^(css|php)?$" | xargs rm -rf && wget --quiet --no-verbose https://download.plugins.jetbrains.com/7622/38887/PhpInspectionsEA.jar && cd - && wget --quiet --no-verbose https://getcomposer.org/composer.phar && mv composer.phar /usr/local/bin/composer && chmod +x /usr/local/bin/composer && composer require --optimize-autoloader kalessil/phpstorm-inspect' returned a non-zero code: 4
~~

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Expected behaviour
~~
Successfully built d34815cad76c
Successfully tagged phpinspectionsea:latest
~~

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Environment details

Information from Help -> About dialog (contains IDE and it's version details).

Notes

• That my first time I contribute to open Source :)
• I have the solution already ( I only must figure out how to contribute it)

[kalessil]

@filipe96, I can accept even patch-file if it makes contribution easier for you =)

Regular workflow is to fork the repository on GitHub, make changes in your fork and create a Pull Request on GitHub.

[kalessil]

Merged #1182