Fix github actions

Author: zonky2

.github/workflows/diagnostics.yml

@@ -0,0 +1,52 @@
+name: MetaModels attribute_alias
+
+on:
+  push:
+    branches-ignore:
+      - '**-translation'
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: [7.4]
+        contao: [~4.9.0]
+
+    steps:
+      - name: PHP ${{ matrix.php }} ${{ matrix.contao }} Pull source
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      # see https://github.com/shivammathur/setup-php
+      - name: PHP ${{ matrix.php }} ${{ matrix.contao }} Setup PHP.
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+
+      - name: PHP ${{ matrix.php }} ${{ matrix.contao }} Cache composer cache directory
+        uses: actions/cache@v1
+        env:
+          cache-name: composer-cache-dir
+        with:
+          path: ~/.cache/composer
+          key: ${{ runner.os }}-build-${{ env.cache-name }}
+
+      - name: PHP ${{ matrix.php }} ${{ matrix.contao }} Cache vendor directory
+        uses: actions/cache@v1
+        env:
+          cache-name: composer-vendor
+        with:
+          path: vendor
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+
+      - name: PHP ${{ matrix.php }} ${{ matrix.contao }} Install composer dependencies
+        run: composer update --prefer-dist --no-interaction --no-suggest
+
+      - name: PHP ${{ matrix.php }} ${{ matrix.contao }} Run tests
+        run: ant -keep-going

.travis.yml

@@ -1,9 +1,9 @@
-[![Build Status](https://travis-ci.org/MetaModels/attribute_select.svg)](https://travis-ci.org/MetaModels/attribute_select)
+[![Build Status](https://github.com/MetaModels/attribute_select/actions/workflows/diagnostics.yml/badge.svg)](https://github.com/MetaModels/attribute_select/actions)
 [![Latest Version tagged](http://img.shields.io/github/tag/MetaModels/attribute_select.svg)](https://github.com/MetaModels/attribute_select/tags)
 [![Latest Version on Packagist](http://img.shields.io/packagist/v/MetaModels/attribute_select.svg)](https://packagist.org/packages/MetaModels/attribute_select)
 [![Installations via composer per month](http://img.shields.io/packagist/dm/MetaModels/attribute_select.svg)](https://packagist.org/packages/MetaModels/attribute_select)
 
 Select
 ======
 
-The select attribute
+The select attribute.

README.md

@@ -66,6 +66,10 @@
     }
   },
   "config": {
+    "allow-plugins": {
+      "contao-components/installer": false,
+      "contao/manager-plugin": false
+    },
     "sort-packages": true
   }
 }