Merge pull request #7105 from Automattic/add/psalm-pipeline

Add Psalm workflow

.github/workflows/psalm.yml

@@ -0,0 +1,47 @@
+name: Psalm Test
+
+on:
+    pull_request:
+    workflow_call:
+
+concurrency:
+    group: ${{ github.workflow }}-${{ github.ref }}
+    cancel-in-progress: true
+
+jobs:
+    tests:
+        name: Psalm
+        runs-on: ubuntu-latest
+        strategy:
+            fail-fast: true
+            max-parallel: 10
+            matrix:
+                php: ['7.3', '8.2']
+        steps:
+            - name: Checkout code
+              uses: actions/checkout@v3
+              with:
+                  fetch-depth: 0
+
+            - name: Get cached composer directories
+              uses: actions/cache@v3
+              with:
+                  path: ~/.cache/composer/
+                  key: ${{ runner.os }}-composer-${{ hashFiles('composer.lock') }}
+            - uses: actions/cache@v3
+              with:
+                  path: vendor/
+                  key: ${{ runner.os }}-vendor-${{ hashFiles('composer.lock') }}
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+                  tools: composer
+                  coverage: none
+
+            - name: Install
+              run: composer install --no-ansi --no-interaction --prefer-dist --no-progress
+
+            - name: Run Psalm
+              run: ./vendor/bin/psalm