chore: migrate to gh actions from travis

.github/workflows/ci.yml

@@ -0,0 +1,11 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  ci:
+    name: CI
+    uses: silverstripe/gha-ci/.github/workflows/ci.yml@v1

.travis.yml

@@ -1,32 +0,0 @@
-language: php
-
-dist: trusty
-
-env:
-  global:
-    - COMPOSER_ROOT_VERSION=2.x-dev
-
-matrix:
-  include:
-    - php: 7.2
-      env: DB=MYSQL PHPUNIT_TEST=1 PHPCS_TEST=1 
-    - php: 7.3
-      env: DB=MYSQL PHPUNIT_COVERAGE_TEST=1
-
-before_script:
-  # Init PHP
-  - phpenv rehash
-  - phpenv config-rm xdebug.ini
-  - composer validate
-  - composer require silverstripe/recipe-cms 4.5.x-dev --no-update
-  - if [[ $DB == PGSQL ]]; then composer require silverstripe/postgresql:2.0.x-dev --no-update; fi
-  - if [[ $PHPCS_TEST ]]; then composer global require squizlabs/php_codesniffer:^3 --prefer-dist --no-interaction --no-progress --no-suggest -o; fi
-  - composer install --prefer-dist --no-interaction --no-progress --no-suggest --optimize-autoloader --verbose --profile
-
-script:
-  - if [[ $PHPUNIT_TEST ]]; then vendor/bin/phpunit tests/; fi
-  - if [[ $PHPUNIT_COVERAGE_TEST ]]; then phpdbg -qrr vendor/bin/phpunit --coverage-clover=coverage.xml; fi
-  - if [[ $PHPCS_TEST ]]; then vendor/bin/phpcs src/ tests/ ; fi
-
-after_success:
-  - if [[ $PHPUNIT_COVERAGE_TEST ]]; then bash <(curl -s https://codecov.io/bash) -f coverage.xml; fi