Github ci/cd pipeline to deploy Azure App Service

For the Microsoft Azure Trial Hackathon on DEV I created a web application to basically perform CRUD operations on a Azure SQL Database. The source code is hosted on GitHub and I decided to use GitHub Actions to create a CICD pipeline.

The repository is based on two branches:

• main where to push code going to production
• dev where to push code to be tested but not deployed

The continuous integration workflow tries to install the Python requirements and runs both on main and dev branches. I have not written any test at the moment.

# This is a basic workflow to help you get started with Actions

name: ci

# Controls when the workflow will run
on:
  # Triggers the workflow on push or pull request events but only for the main branch
  push:
    branches: [ main, dev ]
  pull_request:
    branches: [ main, dev ]

  # Allows you to run this workflow manually from the Actions tab
  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:
    # The type of runner that the job will run on
    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@v2

      - name: Setup Python
        uses: actions/[email protected]
        with:
          # Version range or exact version of a Python version to use, using SemVer's version range syntax.
          python-version: 3.9
          # The target architecture (x86, x64) of the Python interpreter.
          architecture: x64
          
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi

The continuous deployment workflow build and push the Docker image to Azure Container Registry. It runs only on the main branch.

on: [push]
name: cd

jobs:
    build-and-deploy:
        runs-on: ubuntu-latest
        steps:
        # checkout the repo
        - name: 'Checkout GitHub Action'
          uses: actions/checkout@main
          
        - name: 'Login via Azure CLI'
          uses: azure/login@v1
          with:
            creds: $
        
        - name: 'Build and push image'
          uses: azure/docker-login@v1
          with:
            login-server: $
            username: $
            password: $
        - run: |
            docker build . -t $/aifame --file Dockerfile.prod
            docker push $/aifame

The Docker image is not tagged explicitly so that Docker assigns the default tag, latest. I didn’t follow any semantic versioning syntax for the images. Rolling back to a previous version would be a painful operation. However, the latest tag is used by default by Azure App Service to deploy the app.

To configure the Azure App Service I needed to set the following options:

• Registry: the container registry name
• Image: the image name
• Tag: the image tag (default is latest)
• Continuous Deployment: On

The overall diagram of the cicd pipeline is: