feat: 7.1 linter

Dockerfile

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+FROM php:7.1-cli
+
+LABEL "com.github.actions.name"="GA-PHPLint"
+LABEL "com.github.actions.description"="Run PHP linter on PR"
+LABEL "com.github.actions.icon"="aperture"
+LABEL "com.github.actions.color"="blue"
+
+LABEL version="0.0.1"
+LABEL repository="https://github.com/justia/ga-phplint-7.1"
+LABEL homepage="https://github.com/justia/ga-phplint-7.1"
+
+RUN apt-get update && apt-get -y install zip unzip
+
+RUN curl -sS https://getcomposer.org/installer | php -- \
+--install-dir=/usr/bin --filename=composer && chmod +x /usr/bin/composer
+
+RUN mkdir /phplint && cd /phplint && composer require overtrue/phplint && ln -s /phplint/vendor/bin/phplint /usr/local/bin/phplint
+
+COPY "entrypoint.sh" "/entrypoint.sh"
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

README.md

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+# GA-PHPLint7.1
+PHP 7.1 linter.

action.yml

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+# action.yml
+name: 'PHPLint'
+description: 'Run PHP lint on PR'
+outputs:
+  pass: # if code ok
+    description: 'Codes passes linter'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

entrypoint.sh

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+#!/bin/bash
+set -e
+
+phplint ./