feat: build container image and upload into registry

[citrusinesis]

Summary by CodeRabbit

• New Features

  • Official Docker image now published to GitHub Container Registry (ghcr.io/inevitable/crest).
  • Versioned tags for releases and pre-release builds (semver and commit-based) enable reliable pinning and testing.
  • Standardized image metadata/labels included.

• Chores

  • Automated container image build and publish on pushes, tags, and pull requests to main, improving distribution and deployment workflows.

[coderabbitai]

Walkthrough

Adds a new GitHub Actions workflow that builds and publishes a Docker image to GitHub Container Registry for pushes to main, tags matching v*, and pull requests to main. It logs in to ghcr.io, generates tags/labels via metadata, and builds/pushes using docker/build-push-action.

Changes

Cohort / File(s)	Summary
CI/CD: Docker image publishing workflow .github/workflows/upload-image.yml	Introduces a workflow that authenticates to ghcr.io, computes image tags/labels, and builds/pushes Docker images for main, PRs, and v* tags using Docker metadata and build-push actions.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor Dev as Developer
  participant GH as GitHub Actions
  participant CO as actions/checkout@v5
  participant DL as docker/login-action@v3
  participant DM as docker/metadata-action@v5
  participant BP as docker/build-push-action@v6
  participant REG as ghcr.io

  Dev->>GH: Push to main / Tag v* / PR to main
  GH->>CO: Checkout repository
  CO-->>GH: Source code
  GH->>DL: Login to ghcr.io (GITHUB_TOKEN)
  DL-->>GH: Auth session
  GH->>DM: Generate tags & labels (branch/PR/semver/SHA)
  DM-->>GH: tags[], labels{}
  GH->>BP: Build & push image (tags, labels)
  BP->>REG: Push image layers & manifests
  REG-->>BP: Acknowledge publish
  BP-->>GH: Build & push complete

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I thump my paws by the CI light,
New tags hop out—what a sight!
Main, PR, and v-stars too,
Docker dreams in ghcr blue.
With labels neat and pushes swift,
Our image burrows—perfect lift! 🐇🚀

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📥 Commits

Reviewing files that changed from the base of the PR and between b120fb3 and 2c342cf.

📒 Files selected for processing (1)

• .github/workflows/upload-image.yml (1 hunks)

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[citrusinesis]

Railway 세팅하려고 이미지 업로드 하는거라 일단 병합해볼게용