[FEAT] Add Dockerfile for API

[martian56]

This pull request adds initial Docker support for the API service by introducing a production-ready Dockerfile and a corresponding .dockerignore file. These changes enable efficient and secure containerization of the Go application.

Docker support and containerization:

• Added a .dockerignore file to exclude unnecessary files and directories (such as .git, IDE settings, environment files, and documentation) from the Docker build context, improving build performance and security.
• Created a multi-stage Dockerfile for building and running the Go API:
  • Uses a Go builder stage to compile the application.
  • Produces a minimal Alpine-based runtime image with only the compiled binary and migration files.
  • Sets up a non-root user, environment variables, and exposes port 8080 for the service.

Closes #58

[nazarli-shabnam]

Well done buds!

[Copilot]

Pull request overview

Adds initial containerization support for the Go API service by introducing a multi-stage Docker build and a reduced Docker build context, enabling the API to be built and run as a container image.

Changes:

• Added api/Dockerfile with a multi-stage Go build and Alpine runtime stage (non-root user, migrations included, port 8080 exposed).
• Added api/.dockerignore to exclude VCS/IDE files, binaries, and environment files from the Docker build context.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
api/Dockerfile	Multi-stage build for compiling the Go API binary and packaging it with migrations into a minimal runtime image.
api/.dockerignore	Reduces Docker build context to improve build performance and avoid copying local/dev artifacts.

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