FEAT: Release workflow for docker image

[prasadlohakpure]

Description

Release workflow for docker image

This pull request introduces automated Docker image builds and pushes to the release workflow, and adds a production-ready Dockerfile for building and packaging the caterpillar application. The workflow now supports releases triggered from both tags and the main branch, and ensures Docker images are tagged appropriately for different release types.

Workflow automation and Docker integration:

• Updated .github/workflows/release.yaml to trigger releases from both tags and the main branch, allowing for more flexible release management.
• Added conditional logic to only create GitHub releases when triggered by a tag, preventing releases from being created on branch pushes.
• Integrated Docker build and push steps into the release workflow, including Docker Hub authentication, tag extraction, and multi-platform builds for linux/amd64 and linux/arm64.

Dockerfile addition:

• Added build/Dockerfile to enable building the caterpillar binary in a multi-stage process and packaging it into a minimal Alpine-based container image.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation and I have updated the documentation accordingly.
• I have added tests to cover my changes.

[Copilot]

Pull request overview

Adds Docker image build/push automation to the existing release workflow and introduces a multi-stage Dockerfile to package the caterpillar Go application into a container image.

Changes:

• Expand the release workflow trigger to include both version tags (v*) and pushes to main.
• Gate GitHub Release creation so it only occurs for tag-based runs.
• Add Docker Buildx + Docker Hub login + metadata tagging + multi-arch build/push steps, plus a new build/Dockerfile.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
build/Dockerfile	Adds a multi-stage build intended to compile and package caterpillar into an Alpine-based container image.
.github/workflows/release.yaml	Extends the release workflow to run on main and publish Docker images with appropriate tags.

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