Create a dockerfile and workflow for ci via GitHub Actions

.github/workflows/buildcheck.yml

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+on:
+  push:
+  schedule:
+    - cron: 0 10 26 * *
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php:
+          - 7.1
+          - 7.2
+          - 7.3
+          - 7.4-rc
+        composer:
+          - ""
+          - "--prefer-lowest"
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Create Docker Container
+        run: |
+          docker build . -t ci-image --build-arg PHP_VERSION=${{ matrix.php }}
+          docker run --interactive --detach --volume ${{ github.workspace }}:/app --name ci ci-image
+
+      - name: Install Dependencies
+        run: docker exec ci composer update --no-interaction --no-ansi --prefer-dist ${{ matrix.composer }}
+
+      - name: PHPUnit
+        run: docker exec ci vendor/bin/phpunit
+
+      - name: PHPStan
+        run: |
+          docker exec ci vendor/bin/phpstan analyse --level=max src
+          docker exec ci vendor/bin/phpstan analyse --level=max --configuration=phpstan-tests.neon tests
+
+      - name: Coding Standards
+        run: docker exec ci vendor/bin/phpcs --standard=PSR1,PSR2,PSR12 src tests
+
+      - name: Check Dependencies
+        run: docker exec ci vendor/bin/composer-require-checker
+
+      - name: Composer Validate
+        run: docker exec ci composer validate --strict

Dockerfile

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+ARG PHP_VERSION=7.1
+FROM php:${PHP_VERSION}-cli
+
+RUN apt-get update && apt-get install -y libxml2-dev && docker-php-ext-install soap
+RUN docker-php-ext-install sockets
+
+# Install composer to manage PHP dependencies
+RUN apt-get update && apt-get install -y git zip
+RUN curl https://getcomposer.org/download/1.9.0/composer.phar -o /usr/local/sbin/composer
+RUN chmod +x /usr/local/sbin/composer
+RUN composer self-update
+
+WORKDIR /app