Move from Travis CI to GitHub Actions

.gitattributes

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+/.* export-ignore
+/spec export-ignore
+/behat.yml.dist export-ignore

.github/workflows/test.yaml

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+name: Test
+
+on:
+    push:
+    pull_request:
+        types: [opened, synchronize, edited, reopened]
+
+jobs:
+    test:
+        name: PHP ${{ matrix.php-version }} + Symfony ${{ matrix.symfony-version }}
+        runs-on: ubuntu-20.04
+        continue-on-error: false
+        strategy:
+            fail-fast: false
+            matrix:
+                php-version:
+                    - '7.4'
+                    - '8.0'
+                    - '8.1'
+                symfony-version:
+                    - '4.4.*'
+                    - '5.4.*'
+                    - '6.0.*'
+                exclude:
+                    - php-version: '7.4'
+                      symfony-version: '6.0.*'
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  coverage: none
+                  ini-values: "memory_limit=-1"
+                  php-version: ${{ matrix.php-version }}
+                  tools: composer:v2
+
+            - name: Validate composer.json
+              run: composer validate --no-check-lock
+
+            - name: Configure Symfony version
+              run: composer require --no-update "symfony/config:${{ matrix.symfony-version }}" "symfony/dependency-injection:${{ matrix.symfony-version }}"
+
+            - name: Install dependencies
+              run: composer install --prefer-dist --no-progress
+
+            - name: PHPSpec
+              run: vendor/bin/phpspec run -f pretty
+
+            - name: Behat
+              run: vendor/bin/behat -fprogress --strict

.travis.yml

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-language: php
-
-sudo: false
-
-cache:
-  directories:
-    - $HOME/.composer/cache/files
-
-php:
-  - 7.2
-  - 7.3
-  - 7.4
-  - 8.0
-
-env:
-  - SYMFONY_VERSION=3.4.*
-  - SYMFONY_VERSION=4.4.*
-  - SYMFONY_VERSION=5.0.*
-  - SYMFONY_VERSION=5.1.*
-  - SYMFONY_VERSION=5.2.*
-
-install:
-  - composer require symfony/config:${SYMFONY_VERSION} --no-update --no-scripts --prefer-dist
-  - composer update --no-progress
-
-script:
-  - vendor/bin/phpspec run -f pretty
-  - vendor/bin/behat -fprogress --strict