Configure Phan in Github Actions

static.yml

name: Static Code Analysis
on:
 push:
   branches: [ master ]
 pull_request:
   branches: [ master ]
jobs:
 code-analysis:
   runs-on: ubuntu-latest
   steps:
   - uses: actions/checkout@v2
   - name: Install Dependencies
     run: composer install -q --no-ansi --no-interaction --no-scripts --no-progress --prefer-dist
   - name: Run Phan
     run: vendor/bin/phan --no-progress-bar --allow-polyfill-parser --output-mode checkstyle | vendor/bin/cs2pr --graceful-warnings --colorize | true