Feat(ci): Create workflow to build Aries Mediator Agent image and push to ghcr

[i5okie]

Create workflow to build Aries mediator agent and push the image to ghcr.io

[Copilot]

Pull Request Overview

This PR creates a CI/CD workflow to build and publish an Aries Mediator Agent Docker image to GitHub Container Registry. The workflow is designed to trigger on pushes to the main branch when changes are made to the Aries mediator agent directory.

Key changes:

• Adds a GitHub Actions workflow that builds the Aries Mediator Agent on main branch pushes
• Creates a reusable composite action for building and pushing Docker images to GHCR
• Implements proper tagging strategy using semantic versioning and SHA-based tags

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/on_push_main.yaml	Main workflow file that triggers the build process and calls the reusable action
.github/actions/build_agent.yaml	Composite action that handles Docker image building, tagging, and publishing to GHCR

Comments suppressed due to low confidence (1)

.github/workflows/on_push_main.yaml:11

• The job name 'Build Traction Aca-Py' is inconsistent with the workflow name 'Build Aries Mediator Agent'. Consider renaming to 'Build Aries Mediator Agent' for consistency.

    name: "Build Traction Aca-Py"

[WadeBarnes]

DCO check failing.