Requirement and Design document : DevOps- CI/CD

In a Gitflow branching strategy, you typically have two separate pull request (PR) workflows for approving code changes:

1. Feature Branch to Develop Branch (Targets Dev & QA):

• Who submits the PR: A developer submits a PR after completing work on a feature branch.
• What's reviewed: The PR reviewer focuses on the specific feature implementation and related code changes.
• Reviewers: This typically involves developers familiar with the codebase and the feature's functionality.
• Approval criteria: Reviewers assess the code quality, functionality, adherence to coding standards, and successful unit testing of the feature.
• Deployment after merge: Upon successful merge into the develop branch, your CI/CD pipeline (if configured) can automatically deploy the code changes to the development (dev) and quality assurance (QA) environments for further testing.

2. Release Branch to Master Branch (Targets UAT & PROD):

• Who submits the PR: A designated person (e.g., release manager) submits a PR after the release is planned and the release branch is prepared.
• What's reviewed: The PR reviewer focuses on the completeness and stability of the release, ensuring it incorporates all approved features and bug fixes.
• Reviewers: This might involve a broader team, including developers, testers, and potentially stakeholders, depending on the size and criticality of the release.
• Approval criteria: Reviewers assess the overall stability, inclusion of required features and fixes, successful integration testing, and potentially UAT (user acceptance testing) results.
• Deployment after merge: Upon successful merge into the master branch, your CI/CD pipeline can be configured to deploy the code changes to the user acceptance testing (UAT) environment first, followed by production (PROD) after successful UAT sign-off.

Key Points:

• Separate PR workflows ensure focused reviews for features and overall release readiness.
• Approval criteria for each PR stage should be well-defined and communicated within your team.
• Leverage CI/CD pipelines to automate deployments based on branch merges (develop for dev/QA, master for UAT/PROD).

Additional Considerations:

• The number of reviewers and specific approval requirements can be configured within your Git hosting platform's branch policies.
• It's beneficial to have clear documentation outlining the PR workflow and approval process for your team.

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In a Gitflow branching strategy, the PR approver for each workflow typically wouldn't directly trigger deployments to all environments (dev, QA, UAT, PROD). While they play a crucial role in the approval process, deployments are usually automated through CI/CD pipelines. Here's a breakdown:

PR Approver Roles:

• Feature Branch PR (Dev & QA): Reviewers for this PR assess the specific feature implementation. Once approved and merged into the develop branch, the CI/CD pipeline automatically deploys the changes to dev and QA environments.
• Release Branch PR (UAT & PROD): Reviewers for this PR focus on the overall release stability. Upon approval and merging into the master branch, the CI/CD pipeline deploys the code to UAT first, followed by PROD after successful UAT sign-off.

CI/CD Pipeline Automation:

• Your CI/CD pipeline is a set of automated tasks triggered by events like code merges in your Git repository.
• You can configure the pipeline to perform deployments based on the target branch:
  • Merging to develop triggers deployment to dev and QA environments.
  • Merging to master triggers deployment to UAT and then (after UAT approval) to PROD.

Benefits of Automation:

• Reduces manual work and potential errors in deployments.
• Ensures consistent deployment processes across environments.
• Allows for faster feedback loops during development and testing.

PR Approver and Deployment Relationship:

• While PR approvals initiate the deployment process through the CI/CD pipeline, they don't directly control deployments to specific environments.
• The pipeline configuration determines which environments are targeted based on the branch being merged.

Additional Considerations:

• You can configure approval workflows (e.g., requiring multiple reviewers) to ensure proper code review before deployments are triggered.
• Some teams might have a manual approval stage within the CI/CD pipeline for critical deployments (e.g., production releases) before they proceed.

By combining well-defined PR approval processes with automated deployments through CI/CD pipelines, you can achieve a controlled and efficient release workflow in your Gitflow branching strategy.