Improve Docker build

[Masterain98]

Added a .dockerignore file to exclude unnecessary files from Docker context. Refactored Dockerfile to use multi-stage builds, pip cache, and offline wheel installation for faster and more reliable builds. Updated docker-compose.yml to mount .env as read-only.
This pull request introduces several improvements to the project's Docker setup, focusing on optimizing the Docker build process, improving dependency caching, and enhancing the development environment configuration. The changes also include updates to the .env.example and docker-compose.yml files to streamline deployment and environment management.

Docker build and environment improvements:

Major Dockerfile optimizations:

• Refactored the Dockerfile to use multi-stage builds, add pip caching for faster builds, separate dependency installation using wheels, and ensure a cleaner runtime image. Also added a health check placeholder and improved the executable build process with PyInstaller. (#DockerfileL1-R45)

Dependency management:

• Added pyinstaller and pinned setuptools in requirements.build.txt to ensure consistent builds. (#requirements.build.txtR1-R2)

Development environment and deployment configuration:

• Introduced a .dockerignore file to exclude unnecessary files from Docker build context, improving build performance and reducing image size. (#.dockerignoreR1-R16)
• Updated docker-compose.yml to use the latest tag for the image, mount the .env file as read-only, and remove explicit port mapping (now handled elsewhere or by default). (#docker-compose.ymlL9-R14)
• Cleaned up .env.example by removing unused variables related to image tagging and external port mapping. (#.env.exampleL4-L5)

[Copilot]

Pull Request Overview

This PR optimizes the Docker build process through multi-stage builds, dependency caching, and improved context management. The changes reduce build times, improve reproducibility, and streamline the deployment configuration.

Key changes:

• Implemented multi-stage Dockerfile with pip caching and offline wheel installation
• Added .dockerignore to reduce build context size
• Simplified docker-compose.yml by removing configurable ports and tags, making .env read-only

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Dockerfile	Refactored to use multi-stage builds with pip caching and offline wheel installation for optimized builds
requirements.build.txt	Added build-time dependencies with pinned versions
.dockerignore	Excludes unnecessary files from Docker build context
docker-compose.yml	Simplified configuration with hardcoded latest tag and read-only .env mount
.env.example	Removed unused IMAGE_TAG and EXTERNAL_PORT variables

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