Modularize deployment workflows into independent triggerable components

[Copilot]

The monolithic deploy.yaml workflow ran backend creation, Terraform operations, and frontend builds sequentially for every deployment, regardless of what actually changed.

Changes

New Independent Workflows

• deploy-backend.yaml - Creates Terraform state storage (Azure Storage Account/Container). Run once per environment.
• deploy-infra.yaml - Terraform init/apply for all infrastructure resources. Run when infrastructure code changes.
• deploy-app.yaml - Builds and deploys frontend only. Run on every app code change (~2min vs ~10min full deployment).
• destroy-backend.yaml, destroy-infra.yaml, destroy-app.yaml - Corresponding destruction workflows with proper dependency ordering.

Updated Orchestrators

• deploy.yaml / destroy.yaml - Now orchestrate the modular workflows with optional component selection via boolean inputs. Conditional job execution uses always() with result checks to handle skipped dependencies:

deploy-infra:
  if: ${{ always() && github.event.inputs.deploy_infra == 'true' && (needs.backend.result == 'success' || needs.backend.result == 'skipped') }}
  needs: backend

Safety & Documentation

• Backend destroy defaults to false with explicit warnings about state deletion
• Comprehensive usage guide at .github/workflows/README.md covering common scenarios
• Updated all GitHub Actions from v3 to v4

Workflow Dependencies

Deploy:  backend → infra → app
Destroy: app → infra → backend

Each workflow is independently triggerable via workflow_dispatch. Orchestrators maintain backward compatibility while enabling granular control.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Triggerable modular deployment workflow and destroy worflow.</issue_title>
<issue_description>The current pipeline is a monolith disguised as a workflow. Running backend creation, Azure login, and all of Terraform before simply deploying a front-end build is peak inefficiency. To solve we need three distinct, triggerable workflows to succeed to ./github/deploy.yaml and ./github/destroy.yaml :

deploy-backend.yaml: Creates the remote state storage (Azure Blob/Container). This runs once per environment and is rarely touched. destroy-backend.yaml destroys what is created in deploy-backend.yaml, deploy-infra.yaml and deploy-app.yaml

deploy-infra.yaml: Runs Terraform Apply. This is your full IaC deployment and should only run when infrastructure changes. A destroy-infra.yaml destroys what is created in deploy-app.yaml and deploy-infra.yaml

deploy-app.yaml: Builds and deploys the Web App/Frontend. This runs on every code change to the app. destroy-app.yaml destroys what is created in deploy-app.yaml
</issue_description>

<agent_instructions>Go slowly and carefully. this quite a change. Verify the implications as you progress to make sure all is consistent. if you need more info, or not sure, ask me.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Triggerable modular deployment workflow and destroy worflow. #59

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[Copilot]

Pull request overview

This PR successfully modularizes the monolithic deployment and destroy workflows into independent, triggerable components, enabling efficient, granular control over infrastructure deployments. Instead of running backend creation, Terraform operations, and frontend builds sequentially on every deployment, teams can now trigger only the necessary components.

Key Changes:

• Created six independent workflows for deploying and destroying backend storage, infrastructure, and applications separately
• Converted existing deploy.yaml and destroy.yaml into orchestrators with optional component selection via boolean inputs
• Updated GitHub Actions from v3 to v4 across all workflows
• Added comprehensive documentation explaining workflow usage, dependencies, and best practices

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/deploy-backend.yaml	New workflow for creating Terraform state storage (Azure Storage Account/Container)
.github/workflows/deploy-infra.yaml	New workflow for Terraform init/apply operations on infrastructure resources
.github/workflows/deploy-app.yaml	New workflow for building and deploying frontend React application only
.github/workflows/destroy-backend.yaml	New workflow for destroying backend storage with state deletion warnings
.github/workflows/destroy-infra.yaml	New workflow for Terraform destroy operations on infrastructure
.github/workflows/destroy-app.yaml	New workflow for stopping Azure Web App deployment
.github/workflows/deploy.yaml	Updated to orchestrate modular workflows with conditional execution and optional component selection
.github/workflows/destroy.yaml	Updated to orchestrate destruction workflows with safe defaults (backend destroy defaults to false)
.github/workflows/README.md	Comprehensive documentation covering workflow architecture, usage scenarios, and troubleshooting
WORKFLOW_MODULARIZATION_SUMMARY.md	Implementation summary detailing technical decisions, testing considerations, and migration guidance

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[fpittelo]

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