fix: add concurrency controls to prevent concurrent S3 deployments (957)

[Copilot]

Multiple concurrent workflow runs overwrite each other's files in S3. Both dev-deploy.yml and publish.yml now enforce single-deployment concurrency per environment.

Changes

• Added concurrency blocks to both workflows with cancel-in-progress: false
• dev-deploy group for dev environment deployments
• prod-deploy group for production environment deployments

concurrency:
  group: dev-deploy
  cancel-in-progress: false

New deployments queue instead of running concurrently. Each environment has isolated concurrency control.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Set maximum concurrency of dev and prod deploy tasks to one</issue_title>
<issue_description># Overview
Multiple builds running at the same time will write over each other in S3. We need to be sure only a single build can run at a time in a given environment or application. We need to modify the publish.yml and dev-deploy.yml github workflows to have a max concurrency of one.</issue_description>

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

• Fixes Set maximum concurrency of dev and prod deploy tasks to one #957

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[Copilot]

Pull Request Overview

This PR adds concurrency controls to GitHub Actions workflows to prevent race conditions where multiple concurrent workflow runs could overwrite each other's files during S3 deployments. The solution implements environment-specific concurrency groups that queue deployments instead of running them concurrently.

• Added concurrency blocks with cancel-in-progress: false to ensure deployments queue rather than run simultaneously
• Separate concurrency groups for dev (dev-deploy) and production (prod-deploy) environments to allow independent deployment pipelines
• Prevents file corruption and overwrite issues in S3 buckets caused by concurrent aws s3 sync operations

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/dev-deploy.yml	Added dev-deploy concurrency group to serialize deployments to the development S3 bucket
.github/workflows/publish.yml	Added prod-deploy concurrency group to serialize deployments to the production S3 bucket

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