🔧 Docker Image Builder Script

This Bash script checks whether a given Docker image exists locally.
If not, it builds the image from a specified directory containing a Dockerfile.

Useful for CI/CD pipelines, local development automation, and repeatable builds.

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📦 Requirements

• Docker installed and accessible in the system $PATH
• Bash (Unix-like shell)

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🚀 Usage

./build_if_needed.sh <image-name[:tag]> <dockerfile-directory>