Add GA CI

- drop Travis
- drop Scrutinizer

Author: simPod

.gitattributes

@@ -1,5 +1,4 @@
+/.github            export-ignore
 /.gitattributes     export-ignore
 /.gitignore         export-ignore
-/.travis.yml        export-ignore
-/.scrutinizer.yml   export-ignore
 /phpunit.xml        export-ignore

.github/workflows/ci.yaml

@@ -0,0 +1,68 @@
+name: "CI"
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "master"
+  schedule:
+    - cron: "42 3 * * *"
+
+jobs:
+  phpunit:
+    name: "PHPUnit"
+    runs-on: "ubuntu-20.04"
+
+    strategy:
+      matrix:
+        php-version:
+          - "7.1"
+          - "7.2"
+          - "7.3"
+          - "7.4"
+          - "8.0"
+        dependencies:
+          - "highest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+        with:
+          fetch-depth: 2
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          php-version: "${{ matrix.php-version }}"
+          coverage: "pcov"
+          ini-values: "zend.assertions=1"
+
+      - name: "Install dependencies with Composer"
+        uses: "ramsey/composer-install@v1"
+        with:
+          dependency-versions: "${{ matrix.dependencies }}"
+
+      - name: "Run PHPUnit"
+        run: "vendor/bin/phpunit"
+
+  upload_coverage:
+    name: "Upload coverage to Codecov"
+    runs-on: "ubuntu-20.04"
+    needs:
+      - "phpunit"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+        with:
+          fetch-depth: 2
+
+      - name: "Download coverage files"
+        uses: "actions/download-artifact@v2"
+        with:
+          path: "reports"
+
+      - name: "Upload to Codecov"
+        uses: "codecov/codecov-action@v1"
+        with:
+          directory: reports

.scrutinizer.yml

@@ -1,6 +1,6 @@
 # Data Structures for PHP 7
 
-[![Build Status](https://travis-ci.org/php-ds/polyfill.svg?branch=master)](https://travis-ci.org/php-ds/polyfill)
+[![Build Status](https://github.com/php-ds/polyfill/workflows/CI/badge.svg)](https://github.com/php-ds/polyfill/actions?query=workflow%3A%22CI%22+branch%3Amaster)
 [![Packagist](https://img.shields.io/packagist/v/php-ds/php-ds.svg)](https://packagist.org/packages/php-ds/php-ds)
 
 This is a compatibility polyfill for the [extension](https://github.com/php-ds/extension). You should include this package as a dependency of your project