fix: resolve Octane Alpine Docker build dependencies

[ibourgeois]

Summary

• add the missing Alpine development packages required for the generated Octane Dockerfile to compile Swoole on php:8.4-cli-alpine
• keep the Octane runtime feature set intact instead of disabling optional Swoole capabilities
• add Dockerfile regression coverage so the generated stub keeps the required packages in place

Testing

php84 vendor/bin/pest tests/Unit/Docker/DockerfileGeneratorTest.php
php84 "/Users/ibourgeois/Library/Application Support/Herd/bin/composer" test

Manual validation:

• ran a Docker smoke build against the generated Octane Dockerfile shape in a temporary app directory
• the build progressed past the original libbrotlienc and libssl configure failures and into the long Swoole compile stage

Closes #44

[Copilot]

Pull request overview

This PR fixes Alpine-based Octane Docker builds by ensuring the generated Octane Dockerfile installs the missing Alpine development packages needed to compile Swoole on php:8.4-cli-alpine, and adds regression test coverage to prevent the packages from being dropped in future stub edits.

Changes:

• Add brotli-dev and openssl-dev to the Octane Dockerfile stub before pecl install swoole.
• Extend the Dockerfile generator unit test to assert the Octane output includes these dependencies (and keeps them in the expected apk add block).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
stubs/docker/octane.Dockerfile.stub	Adds Alpine dev packages required for Swoole compilation (Brotli + OpenSSL) in the Octane image.
tests/Unit/Docker/DockerfileGeneratorTest.php	Adds assertions to ensure the generated Octane Dockerfile continues to include these packages.

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