Boost Efficiency: The Ultimate Guide to Reusable Workflows in GitHub Actions for Docker Image Build and Push
Home Boost Efficiency: The Ultimate Guide to Reusable Workflows in GitHub Actions for Docker Image Build and Push
By: John Abhilash / November 30, 2023
In the ever-evolving landscape of DevOps, automation is key to streamlining workflows, enhancing collaboration, and ensuring efficiency. GitHub Actions provides a powerful platform for automating tasks, and one of its notable features is the ability to create reusable workflows. This blog will guide you through the process of creating a reusable workflow in GitHub Actions and demonstrate its application in a Docker build and push scenario.
Why Reusable Workflows?
Reusable workflows in GitHub Actions offer several advantages:
Code Reusability: Define a workflow once and reuse it across multiple repositories, reducing redundancy and ensuring consistency.
Centralized Maintenance: Make updates or improvements in a single workflow file, and those changes reflect across all repositories using it.
Consistent CI/CD Processes: Enforce standardized CI/CD practices by sharing the same workflow definition across projects.
Time and Effort Savings: Save time by avoiding the need to recreate similar workflows for different repositories.
Getting Started with Reusable Workflows
Let’s start by creating a reusable workflow for a common scenario: building a Docker image and pushing it to a container registry. We’ll use GitHub Actions, Docker, and a hypothetical container registry for this example.
Step 1: Create a Reusable Workflow
In your GitHub repository, create a directory named .github/workflows if it doesn’t already exist.
Inside the .github/workflows directory, create a file named docker-build-push.yml. This YAML file will define our reusable workflow.
Open docker-build-push.yml in your preferred code editor and start by specifying the name and trigger for the workflow:
name:DockerBuildandPush on: push: branches: -main
This workflow will be triggered on each push to the main branch.
Define reusable jobs for building and pushing the Docker image:
Replace 'your-dynamic-image-name' with the actual image name you want to use.
Save and commit the changes.
Push a change to the main branch in the second repository, and the reusable workflow will use the provided image name.
Creating reusable workflows in GitHub Actions significantly enhances automation capabilities, fostering consistency and reducing redundancy across projects. In this blog, we walked through creating a reusable workflow for Docker build and push, and demonstrated how to use it in different repositories while passing dynamic variables. Leveraging this approach can streamline your CI/CD processes and contribute to a more efficient and collaborative development environment.