add runner

.github/workflows/main.yaml

@@ -3,12 +3,11 @@ name: 00 Basic Workflow
 # Controls when the workflow will run
 on: [push, pull_request, workflow_dispatch]
 
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   # This workflow contains a single job called "build"
   build:
+    runs-on: ubuntu-latest   
 
-    # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v4.1.1
@@ -16,3 +15,4 @@ jobs:
       # Runs a single command using the runners shell
       - name: Run a one-line script
         run: echo Hello, world!
+