chore: add ci workflow

.github/workflows/ci.yaml

@@ -0,0 +1,73 @@
+name: "Continuous Integration"
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  phpunit:
+    name: "Unit Tests"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+
+      - name: "Install PHP"
+        uses: shivammathur/setup-php@v2
+        with:
+          coverage: "pcov"
+          php-version: "8.3"
+          ini-values: memory_limit=-1
+          extensions: sodium, fileinfo, redis
+
+      - name: "Install dependencies"
+        uses: ramsey/composer-install@v2
+        with:
+          dependency-versions: "locked"
+
+      - name: "Run PHPUnit"
+        run: composer test
+
+  psalm:
+    name: "Static Analysis"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+
+      - name: "Install PHP"
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.1"
+          ini-values: memory_limit=-1
+          extensions: sodium, fileinfo, redis
+
+      - name: "Install dependencies"
+        uses: ramsey/composer-install@v2
+        with:
+          dependency-versions: "locked"
+
+      - name: "Run Psalm"
+        run: composer psalm
+
+  phpcs:
+    name: "Code Style"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+
+      - name: "Install PHP"
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.1"
+          ini-values: memory_limit=-1
+          extensions: sodium, fileinfo, redis
+
+      - name: "Install dependencies"
+        uses: ramsey/composer-install@v2
+        with:
+          dependency-versions: "locked"
+
+      - name: "Run PHPCS"
+        run: composer cs-check