Enhance CI configuration and remove unnecessary project file

[arkdevuk]

This pull request updates the CI workflow and removes the app_events.md documentation file. The CI workflow changes focus on improving build performance and reliability by adding concurrency controls, using Docker Buildx with caching, and caching Composer downloads. The removal of app_events.md eliminates the documentation of application-level events.

CI Workflow Improvements:

• Added a concurrency group to the workflow to auto-cancel stale runs for the same branch or PR, preventing wasted CI minutes.
• Set explicit permissions for the workflow, restricting it to read-only access to repository contents for increased security.
• Replaced the direct make build step with Docker Buildx for building the dev image, enabling GitHub Actions cache for faster builds and avoiding unnecessary rebuilds.
• Added caching for Composer downloads using the actions/cache action and mounted the cache into the container, speeding up dependency installation. [1] [2]
• Updated the Composer install step to mount the cache directory and set the COMPOSER_CACHE_DIR environment variable, further optimizing dependency management.

Documentation Removal:

• Removed the app_events.md file, which previously documented all application-level events, their payloads, and dispatch triggers.

[Copilot]

Pull request overview

This pull request updates the repository’s CI workflow to improve build speed/reliability (via concurrency + Docker Buildx caching + Composer download caching) and removes the app_events.md documentation file from the repo.

Changes:

• Add workflow-level concurrency to auto-cancel superseded runs on the same ref.
• Switch dev image build to Docker Buildx with GitHub Actions cache backend, and add Composer download caching mounted into the container.
• Remove app_events.md.

Reviewed changes

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

File	Description
.github/workflows/ci.yml	Adds concurrency + permissions, builds the dev image with buildx+GHA cache, and caches Composer downloads for faster installs.
app_events.md	Removes the application events documentation file.

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