added GitHub Actions workflows

Author: dg

.github/workflows/coding-style.yml

@@ -0,0 +1,31 @@
+name: Coding Style
+
+on: [push, pull_request]
+
+jobs:
+    nette_cc:
+        name: Nette Code Checker
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 8.3
+                  coverage: none
+
+            - run: composer create-project nette/code-checker temp/code-checker ^3 --no-progress
+            - run: php temp/code-checker/code-checker --strict-types --no-progress
+
+
+    nette_cs:
+        name: Nette Coding Standard
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 8.3
+                  coverage: none
+
+            - run: composer create-project nette/coding-standard temp/coding-standard ^3 --no-progress
+            - run: php temp/coding-standard/ecs check

.github/workflows/static-analysis.yml

@@ -0,0 +1,17 @@
+name: Static Analysis
+
+on: [push, pull_request]
+
+jobs:
+    phpstan:
+        name: PHPStan
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 8.5
+                  coverage: none
+
+            - run: composer install --no-progress --prefer-dist
+            - run: composer phpstan -- --no-progress

.github/workflows/tests.yml

@@ -0,0 +1,28 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+    tests:
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                php: ['8.2', '8.3', '8.4', '8.5']
+
+            fail-fast: false
+
+        name: PHP ${{ matrix.php }} tests
+        steps:
+            - uses: actions/checkout@v4
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+                  coverage: none
+
+            - run: composer install --no-progress --prefer-dist
+            - run: composer tester
+            - if: failure()
+              uses: actions/upload-artifact@v4
+              with:
+                  name: output-${{ matrix.php }}
+                  path: tests/**/output