feat: add GitHub Action to psalm

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

.github/workflows/psalm.yml

@@ -0,0 +1,39 @@
+name: Static analysis
+
+on: pull_request
+
+concurrency:
+  group: psalm-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  static-analysis:
+    runs-on: ubuntu-latest
+
+    name: static-psalm-analysis
+    steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+
+      - name: Set up php8.1
+        uses: shivammathur/setup-php@ccf2c627fe61b1b4d924adfcbd19d661a18133a0 # v2.35.2
+        with:
+          php-version: 8.1
+          extensions: json, openssl
+          coverage: none
+          ini-file: development
+          # Temporary workaround for missing pcntl_* in PHP 8.3
+          ini-values: disable_functions=
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install dependencies
+        run: composer i
+
+      - name: Run coding standards check
+        run: composer run psalm -- --output-format=github