Github Actions and Lambda Deployment (CD)

lambda_deploy.yml

on:
  push:
    branches:
      - master
    paths:
    - '**.py'
    - '.github/workflows/lambda_deploy.yml'

env:
  AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
  AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
  AWS_DEFAULT_REGION: us-east-1
  LAMBDA_FUNCTION_NAME: my-function
  LAMBDA_LAYER_NAME: my-function_dependencies
  LAMBDA_RUNTIME: python3.6

jobs:
  deploy:
    runs-on: ubuntu-18.04
    steps:
      - uses: actions/checkout@v2
      - name: Set up Python
        uses: actions/setup-python@v1
        with:
          python-version: 3.6
      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y build-essential libpoppler-cpp-dev pkg-config python-dev
          pip install --target=python boto3
      # from: mariamrf/py-lambda-action
      - name: install_zip_dependencies
        run: |
          echo "Installing and zipping dependencies..."
          mkdir -p python
          pip install --target=python -r requirements.txt
          zip -r dependencies.zip ./python
      - name: publish_dependencies_as_layer
        run: |
          echo "Publishing dependencies as a layer..."
          result=$(aws lambda publish-layer-version --layer-name "${LAMBDA_LAYER_NAME}" --zip-file fileb://dependencies.zip)
          echo $result
          LAYER_VERSION_ARN=$(jq '.LayerVersionArn' <<< "$result")
          echo ::set-env name=LAYER_VERSION_ARN::$LAYER_VERSION_ARN
          rm -rf python
          rm dependencies.zip
      - name: publish_function_code
        run: |
          echo "Deploying the code itself..."
          zip -r code.zip . -x \*.git\*
          aws lambda update-function-code --function-name "${LAMBDA_FUNCTION_NAME}" --zip-file fileb://code.zip
      - name: update_function_layers
        run: |
          echo "Using the layer in the function..."
          aws lambda update-function-configuration --function-name "${LAMBDA_FUNCTION_NAME}" --layers "${LAYER_VERSION_ARN}"