I am learning about azure and github ci/cd with simple docker-compose setup which is running perfectly on my dev machine but is constantly failing on Azure WebApp with below Errors:

2024-09-04T16:12:01.352714815Z The command could not be loaded, possibly because:
2024-09-04T16:12:01.352738315Z * You intended to execute a .NET application:
2024-09-04T16:12:01.352775915Z The application 'foo.dll' does not exist.
2024-09-04T16:12:01.352781015Z * You intended to execute a .NET SDK command:
2024-09-04T16:12:01.352784615Z No .NET SDKs were found.
2024-09-04T16:12:01.352787915Z
2024-09-04T16:12:01.352790915Z Download a .NET SDK:
2024-09-04T16:12:01.352794015Z https://aka.ms/dotnet/download
2024-09-04T16:12:01.352797215Z
2024-09-04T16:12:01.352800215Z Learn about SDK resolution:
2024-09-04T16:12:01.352806415Z https://aka.ms/dotnet/sdk-not-found

On further checking logs in Deployment Center/Container Logs, I observed that WebApp internally doesn’t even call docker-compose up to start the containers which works perfectly fine on my dev machine but instead runs below commands:

2024-09-04T16:20:41.519Z INFO - Starting multi-container app..
2024-09-04T16:20:42.049Z INFO - Pulling image: bar.azurecr.io/web:latest
2024-09-04T16:20:42.218Z INFO - latest Pulling from web
2024-09-04T16:20:42.265Z INFO - Digest: sha256:<redacted>
2024-09-04T16:20:42.265Z INFO - Status: Image is up to date for bar.azurecr.io/web:latest
2024-09-04T16:20:42.279Z INFO - Pull Image successful, Time taken: 0 Seconds
2024-09-04T16:20:42.339Z INFO - Starting container for site
2024-09-04T16:20:42.340Z INFO - docker run -d -p 6733:5104 --name foo_web-app_0_871e06a6 -e WEBSITES_ENABLE_APP_SERVICE_STORAGE=true -e WEBSITE_SITE_NAME=foo -e WEBSITE_AUTH_ENABLED=False -e WEBSITE_ROLE_INSTANCE_ID=0 -e WEBSITE_HOSTNAME=foo.azurewebsites.net -e WEBSITE_INSTANCE_ID=<some_id> bar.azurecr.io/web:latest
2024-09-04T16:20:42.341Z INFO - Logging is not enabled for this container.
Please use https://aka.ms/linux-diagnostics to enable logging to see container logs here.
2024-09-04T16:20:42.887Z INFO - Pulling image: bar.azurecr.io/db:latest
2024-09-04T16:20:43.082Z INFO - latest Pulling from db
2024-09-04T16:20:43.141Z INFO - Digest: sha256:<redacted>
2024-09-04T16:20:43.142Z INFO - Status: Image is up to date for bar.azurecr.io/db:latest
2024-09-04T16:20:43.154Z INFO - Pull Image successful, Time taken: 0 Seconds
2024-09-04T16:20:43.212Z INFO - Starting container for site
2024-09-04T16:20:43.213Z INFO - docker run -d --expose=1433 --name foo_db_0_871e06a6 -e WEBSITES_ENABLE_APP_SERVICE_STORAGE=true -e WEBSITE_SITE_NAME=foo -e WEBSITE_AUTH_ENABLED=False -e WEBSITE_ROLE_INSTANCE_ID=0 -e WEBSITE_HOSTNAME=foo.azurewebsites.net -e WEBSITE_INSTANCE_ID=<some_id> bar.azurecr.io/db:latest
2024-09-04T16:20:43.214Z INFO - Logging is not enabled for this container.
Please use https://aka.ms/linux-diagnostics to enable logging to see container logs here.

My sample Docker-Compose file

name: sample-app
services:
    web-app:
        image: bar.azurecr.io/web:latest
        environment:
            - ConnectionStrings__DefaultConnection=Server=db;Database=${DbName};User Id=${UserName};Password=${Password};MultipleActiveResultSets=true; TrustServerCertificate=true
        ports:
            - "80:5104"
        volumes:
            - ${WEBAPP_STORAGE_HOME}/app_data:/app
        networks:
            - isolated_network
        depends_on:
            - db    
    db:
        image: bar.azurecr.io/db:latest
        ports:
        - "1433:1433"
        networks:
            - isolated_network
        volumes:
            - ${WEBAPP_STORAGE_HOME}/db_data:/var/opt/mssql
networks:
    isolated_network:
        driver: bridge

My GitHub Workflow file:

name: Build and deploy ASP.Net Core app to an Azure Web App

env:
  ACR_NAME: bar
  AZURE_WEBAPP_NAME: foo    
  AZURE_WEBAPP_PACKAGE_PATH: '.'      
  
on:
  push:
    branches: [ "main" ]
  workflow_dispatch:

permissions:
  contents: read

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout repository
      uses: actions/checkout@v2

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v1
    
    - name: Log in to Azure
      uses: azure/login@v1
      with:
        creds: ${{ secrets.AZURE_CREDENTIALS }}

    - name: Log in to Azure Container Registry
      run: |
        az acr login -n ${{ env.ACR_NAME }}
        
    - name: Build and push Web image
      uses: docker/build-push-action@v2
      with:
        context: .
        push: true
        tags: ${{ env.ACR_NAME }}.azurecr.io/web:latest

    - name: Build and push Db image
      uses: docker/build-push-action@v2
      with:
        context: .
        file: ./DockerDbfile
        push: true
        tags: ${{ env.ACR_NAME }}.azurecr.io/db:latest

    - name: Deploy to Azure Web App
      id: deploy-to-webapp
      uses: azure/webapps-deploy@v2
      with:
        app-name: ${{ env.AZURE_WEBAPP_NAME }}
        configuration-file: 'docker-compose.yml'

My questions are:

1. Considering that I am using github workflows to build the image, push it to acr and then running docker-compose on webapp all hosted in same subscription, is there a better way to do this?
2. Any idea on how to troubleshoot the current setup further as this is a very simple use case with .net MVC Core application as web and sqlserver as db all running on docker.
3. Why did the WebApp not run docker-compose up in container logs 🙂