Example GitHub Action for building and deploying a .NET Core app to Azure.

github-action-dotnet.yml

name: Build and deploy to Azure

on: [push]

env:
  PROJECT_DIR: yourapp/path
  AZURE_WEBAPP_NAME: yourapp-name  
  DOTNET_VERSION: '2.2.402'

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    steps:

    # Checkout the repo
    - uses: actions/checkout@master

    # Setup .NET Core SDK
    - name: Setup .NET Core
      uses: actions/setup-dotnet@v1
      with:
        dotnet-version: ${{ env.DOTNET_VERSION }} 

    # Run dotnet build and publish
    - name: dotnet build and publish
      run: |
        cd ${{ env.PROJECT_DIR }}
        dotnet build --configuration Release
        dotnet publish -c Release -o publish 
        
    # Deploy to Azure Web apps
    - name: 'Run Azure webapp deploy action using publish profile'
      uses: azure/webapps-deploy@v2
      with: 
        app-name: ${{ env.AZURE_WEBAPP_NAME }} 
        publish-profile: ${{ secrets.AZURE_WEBAPP_PUBLISH_PROFILE  }} 
        package: '${{ env.PROJECT_DIR }}/publish'