add PHP application template

[endersonmaia]

This pull request introduces PHP support to the project, including updates to configuration files, Docker setup, and the addition of a new PHP script. The most important changes include adding PHP to the build workflow, setting up Docker configurations for PHP, and creating a PHP script to handle rollup requests.

PHP Support Integration:

• Build Workflow Update:

  • Added PHP to the list of languages in the build workflow configuration file. (.github/workflows/build.yaml)

• Docker Configuration:

  • Created a Dockerfile for PHP, including stages for building and running a PHP application with necessary dependencies. (php/Dockerfile)
  • Added .dockerignore entries to exclude unnecessary directories and files from the Docker build context. (php/.dockerignore)

• Git Ignore Update:

  • Updated .gitignore to exclude PHP-specific directories and files. (php/.gitignore)

• PHP Dependencies:

  • Added composer.json to manage PHP dependencies, including Guzzle HTTP client. (php/composer.json)

• PHP Script:

  • Added index.php to handle rollup requests, using Guzzle HTTP client for making HTTP requests. (php/index.php)