Add actions/checkout

Author: yabjames

.github/workflows/server_workflows.yml

@@ -11,7 +11,7 @@ jobs:
     container:
       image: conanio/gcc11-ubuntu16.04:2.23.0
     steps:
-#      - uses: actions/checkout@v3
+      - uses: actions/checkout@v3
 
       - name: Install Conan packages
         run: |