Add Docker and Docker Compose support for fasthttp-postgres quickstart

[Syedowais312]

Summary

Adds Docker and Docker Compose support for the fasthttp-postgres quickstart, allowing it to be run with a single command.

Problem

Previously, running the fasthttp-postgres quickstart required:

• Manual Go environment setup
• A locally running PostgreSQL instance
• Hardcoded database configuration

This made onboarding and testing the sample unnecessarily complex.

Solution

This PR containerizes both the application and the database using Docker and Docker Compose, enabling a fully reproducible and beginner-friendly setup.

Changes

• Added a multi-stage Dockerfile for the Go application
• Updated docker-compose to include the application service
• Configured PostgreSQL connectivity using environment variables
• Removed hardcoded database configuration
• Added missing PostgreSQL driver import required by database/sql

How to Run

docker compose up

###Access

http://localhost:8080

Verification

• Built and ran the setup using docker compose up --build

• Verified PostgreSQL initialization and migrations

• Confirmed successful database connection from the application

• Verified application startup without runtime errors

Notes

• The application connects to PostgreSQL using the Docker service name

• No manual database setup is required

• Changes are limited to the quickstart and do not affect existing functionality

Fixes: keploy/keploy#3405

Screenshot:

[Achanandhi-M]

Hey @Syedowais312 , the changes look good overall 👍

A couple of suggestions:

• Please avoid using the latest Alpine image in the Dockerfile and switch to a specific version instead.

• The README should cover two ways to run the app:

  1. Using Docker Compose
  2. Running the app without Docker
     Currently, it only documents the Docker Compose method.

• Please remove the gocoverage command from the Keploy test command. We don’t have a gocoverage flag when running Keploy via the Docker Compose method.

[Syedowais312]

Thanks for the review @Achanandhi-M!

I’ve updated the Dockerfile to pin the Alpine base image to a specific version and added documentation for running the application without Docker.
I also fixed minor README typos and formatting for clarity.

Please let me know if any further changes are needed.