Feature: Add Docker Support

[sodium16]

Description

Fixes #8284

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (localhost:3000/api/streak?user=YOUR_USERNAME).
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• My commits follow the Conventional Commits format (e.g., feat(themes): ..., fix(calculate): ...).
• I have updated README.md if I added a new theme or URL parameter.
• I have started the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

[vercel]

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[retenta-bot]

This PR adds Docker support, which is a significant enhancement for deployment and development workflows. It aligns with our ongoing efforts to improve user experience and streamline contributions. Please ensure that the Docker setup is well-documented in the README, as this will help new contributors. If you have any questions or need further assistance, feel free to reach out. Happy coding!

[Copilot]

Pull request overview

Adds first-class Docker support so CommitPulse can be run and deployed in containers (including a local MongoDB via Compose), aligning with the self-hosting goals in #8284.

Changes:

• Document Docker-based workflows in README.md (Compose for local runs + docker build/run for production).
• Enable Next.js standalone output to support slimmer runtime images.
• Add Docker artifacts: Dockerfile, docker-compose.yml, and .dockerignore.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
README.md	Adds Docker usage documentation for local and production container runs.
next.config.ts	Enables output: 'standalone' so Next builds can be packaged into a smaller runtime image.
Dockerfile	Introduces a multi-stage build that runs a Next standalone server in production.
docker-compose.yml	Defines an app service plus a MongoDB service for containerized local runs.
.dockerignore	Reduces Docker build context size and avoids copying local env files into builds.

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[github-actions]

📦 Next.js Bundle Size Report (Gzipped Sizes)

✨ No significant bundle size changes detected.

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	4939.27 KB	4939.27 KB	0 B
Total CSS	348.46 KB	348.46 KB	0 B