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Build a Docker image

Use Duplo to build and push a docker image from Github Actions
Avoid using capital letters when referencing a DuploCloud construct, such as a Tenant, even when the UI displays the string as all capital letters. Don't specify DEV01 for example, specify dev01.

Build and Push to ECR

The goal of this section is to show how you can build a docker image and push it to ECR.
It does three basic things:
  • Logs in to AWS ECR (using just-in-time AWS credentials from Duplo)
  • Builds and tags your docker image, with the tag based on the git commit SHA.
  • Pushes your docker image

Example Workflow

Here is an example github workflow that builds a docker image and pushes it to ECR.
To use it you will need to change:
  • duplo_host env var
  • <SERVICE_NAME> env var
  • <TENANT_NAME> env var
name: Build and Deploy
on:
# (Optional) Allows users to trigger the workflow manually from the GitHub UI
workflow_dispatch:
# Triggers the workflow on push to matching branches
push:
branches:
- master
env:
duplo_host: https://mysystem.duplocloud.net # CHANGE ME!
duplo_token: "${{ secrets.DUPLO_TOKEN }}"
SERVICE_NAME: myservice # CHANGE ME!
TENANT_NAME: mytenant # CHANGE ME!
# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
build:
runs-on: ubuntu-latest
steps:
- name: Checkout
uses: actions/checkout@v3
# Set up for docker build
- name: Get AWS credentials
uses: duplocloud/ghactions-aws-jit@master
with:
tenant: default
- name: Login to Amazon ECR
id: login-ecr
uses: aws-actions/amazon-ecr-login@v1
# Build and push the docker image
- name: Docker Build and Push
uses: docker/build-push-action@v4
with:
context: .
push: true
tags: |
${{ steps.login-ecr.outputs.registry }}/${{ env.SERVICE_NAME }}:${{ github.sha }}
# This part is important - it will be used by the deploy job
outputs:
image: "${{ steps.login-ecr.outputs.registry }}/${{ env.SERVICE_NAME }}:${{ github.sha }}"