Run PHPCS and PHPStan in GitHub Actions

Fixes #76

.github/workflows/coding-standards.yml

@@ -0,0 +1,39 @@
+name: Run coding standards checks
+
+on:
+  push:
+    branches:
+      - production
+  pull_request:
+
+jobs:
+  phpunit:
+    runs-on: ubuntu-latest
+
+    name: "Run coding standards checks"
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Cache dependencies
+        uses: actions/cache@v1
+        with:
+          path: |
+            ~/.composer/cache/files
+            web/core
+            web/modules/constrib
+            web/themes/contrib
+            vendor
+          key: dependencies-composer-${{ hashFiles('composer.json') }}
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.4
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-interaction --no-suggest
+
+      - name: Run checks
+        run: make phpcs

.github/workflows/static-code-analysis.yml

@@ -0,0 +1,39 @@
+name: Static analysis with PHPStan
+
+on:
+  push:
+    branches:
+      - production
+  pull_request:
+
+jobs:
+  phpunit:
+    runs-on: ubuntu-latest
+
+    name: Static analysis with PHPStan
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Cache dependencies
+        uses: actions/cache@v1
+        with:
+          path: |
+            ~/.composer/cache/files
+            web/core
+            web/modules/constrib
+            web/themes/contrib
+            vendor
+          key: dependencies-composer-${{ hashFiles('composer.json') }}
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.4
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-interaction --no-suggest
+
+      - name: Run checks
+        run: make phpstan