Add GH Actions build for static analysis

.github/workflows/tests.yaml

@@ -0,0 +1,39 @@
+name: Tests and linting
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron:  '0 3 * * *'
+
+jobs:
+  codestyle:
+      name: "Code style and static analysis"
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v2
+
+        - name: Setup PHP
+          uses: shivammathur/setup-php@v2
+          with:
+            php-version: '7.4'
+            extensions: mbstring, intl
+            tools: composer:v2
+
+        - name: Install dependencies
+          run: composer update --no-progress
+
+        - name: Lint
+          run: composer lint
+
+        - name: Run checks
+          run: composer analyze
+
+  markdown-link-check:
+    name: "Markdown link check"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: gaurav-nelson/github-action-markdown-link-check@v1
+        with:
+          use-verbose-mode: 'yes'

.travis.yml

@@ -25,7 +25,6 @@ matrix:
       before_script: ~
       script:
         - composer lint
-        - composer codestyle:check
         - composer analyze
       after_success: ~
 

composer.json

@@ -92,16 +92,13 @@
         "all": [
             "@lint",
             "@analyze",
-            "@codestyle:check",
             "@test"
         ],
         "analyze": [
+            "vendor/bin/ecs check src/ src-tests/ --ansi",
             "vendor/bin/phpstan analyze -c phpstan.neon --ansi"
         ],
-        "codestyle:check": [
-            "vendor/bin/ecs check src/ src-tests/ --ansi"
-        ],
-        "codestyle:fix": [
+        "fix": [
             "@composer normalize",
             "vendor/bin/ecs check src/ src-tests/ --ansi --fix"
         ],