ci: Add missing libyaml-dev

Author: bd808

.github/workflows/main.yml

@@ -26,6 +26,10 @@ jobs:
           - "8.1"
 
     steps:
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libyaml-dev
       - name: Checkout repo
         uses: actions/checkout@v2
       - name: Setup PHP