[WIP] Update Dockerfile to use PHP 8.4 and multi-stage builds

[Copilot]

Plan: Update Dockerfile to use PHP 8.4 with multi-stage build

• Analyze current Dockerfile structure
• Modify Dockerfile to use multi-stage build with php:8.4-alpine base
• Copy composer binary from composer:latest
• Verify environment variables and paths are correct
• Test the Docker build locally
• Validate the image works correctly

Original prompt

On Dockerfile, the composer:latest image has php v8.5
so, i want you to use the php:8.4-alpine instead and copy the composer binary from composer:latest instead via multi stage builds.

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