[CI] Add code_analysis and validate composer

Author: TomasVotruba

.github/workflow/code_analysis.yaml

@@ -0,0 +1,32 @@
+name: Code Analysis
+
+on:
+    pull_request: null
+
+jobs:
+    code_analysis:
+        strategy:
+            fail-fast: false
+            matrix:
+                actions:
+                    -
+                        name: 'Validate'
+                        # this is very slow, so it has to be in own workflow
+                        run: composer validate --strict
+
+        name: ${{ matrix.actions.name }}
+        runs-on: ubuntu-latest
+
+        steps:
+            -   uses: actions/checkout@v2
+
+            # see https://github.com/shivammathur/setup-php
+            -
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: 7.3
+                    coverage: none
+
+            -   uses: "ramsey/composer-install@v1"
+
+            -   run: ${{ matrix.actions.run }}

composer.json

@@ -1,5 +1,7 @@
 {
     "name": "rector/php-parser-nodes-docs",
+    "license": "MIT",
+    "description": "Generate visual docs for php-parser nodes - the first step to master AST",
     "require": {
         "php": "^8.0",
         "symfony/console": "^5.2",