add checkout action

Author: vsouza

.github/workflows/main.yml

@@ -12,6 +12,12 @@ jobs:
       contents: write
       id-token: write
     steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          registry-url: 'https://registry.npmjs.org'
+          
       - name: Test Converts markdown text to HTML
         uses: ./
         with: