Add psalm in CI

.github/workflows/psalm.yml

@@ -0,0 +1,65 @@
+name: Psalm
+
+on:
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - 'bin/**'
+      - 'resources/**'
+      - 'README.md'
+      - 'CHANGELOG.md'
+      - '.gitignore'
+      - '.gitattributes'
+      - '.editorconfig'
+      - 'psalm.xml'
+
+  push:
+    paths-ignore:
+      - 'docs/**'
+      - 'bin/**'
+      - 'resources/**'
+      - 'README.md'
+      - 'CHANGELOG.md'
+      - '.gitignore'
+      - '.gitattributes'
+      - '.editorconfig'
+      - 'psalm.xml'
+
+jobs:
+  psalm:
+    name: Psalm Validation (PHP ${{ matrix.php }}, OS ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    continue-on-error: true
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [8.2]
+        os: [ubuntu-latest]
+    steps:
+      - name: Set up PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom
+
+      - name: Check Out Code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Get Composer Cache Directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache Dependencies
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: php-${{ matrix.php }}-${{ runner.os }}-composer-
+
+      - name: Install Composer Dependencies
+        run: composer install --prefer-dist --no-interaction
+
+      - name: Run Tests
+        run: vendor/bin/psalm