This pull request introduces PHP build support to the deployment workflow, updates the Docker base image and environment variables, and improves the handling of dependencies. Below is a summary of the most important changes:

PHP Build Support:

• Added new environment variables (PHP_BUILD_DIRECTORY, PHP_BUILD_COMMAND, PHP_BUILD_SCRIPT, PHP_VERSION) to allow custom PHP build steps before deployment. Relevant documentation was updated in README.md to describe these variables and their usage.
• Introduced two new functions in main.sh:
  • maybe_install_php_dep: Installs the specified PHP version and its dependencies, validating the version against a predefined list.
  • maybe_run_php_build: Executes PHP build commands or scripts in the specified directory.
• Integrated the new PHP build steps into the main deployment workflow (function main) in main.sh.

Dockerfile Updates:

• Updated the base image from ubuntu:22.04 to ubuntu:24.04 for improved compatibility and security.

Documentation Enhancements:

• Expanded the README.md to include detailed instructions for configuring both PHP and Node.js build steps, with examples of environment variable usage.