docs: guide to manually publish docker images

[rootulp]

Motivated by https://github.com/celestiaorg/celestia-app/issues/3934

[coderabbitai[bot]]

📝 Walkthrough

## Walkthrough The changes in this pull request involve the addition of a comprehensive guide to `docs/maintainers/docker.md`. This guide outlines the manual process for building and publishing a Docker image when GitHub Actions fail. It includes prerequisites, such as generating a GitHub token, and detailed steps for verifying existing images, setting environment variables, logging into the GitHub Container Registry, and using Docker Buildx to build and push the image. ## Changes | File | Change Summary | |-------------------------------|---------------------------------------------------------------------------------------------------| | docs/maintainers/docker.md | Added a guide for manually building and publishing a Docker image, including prerequisites and steps. | ## Sequence Diagram(s) ```mermaid sequenceDiagram participant User participant GitHub participant Docker User->>GitHub: Generate GitHub token User->>Docker: Set CR_PAT environment variable User->>Docker: Log into GitHub Container Registry User->>Docker: Build Docker image (v2.2.0-mocha) User->>Docker: Push image to GHCR User->>GitHub: Verify image publication on GHCR ```

---

📜 Recent review details

**Configuration used: .coderabbit.yaml** **Review profile: CHILL**

📥 Commits

Files that changed from the base of the PR and between 19606fb30e0261918e5700bc7ffe13a6043d95e7 and b7790b6362b51502f8ef00ca718214c00bf6e65a.

📒 Files selected for processing (1)

* docs/maintainers/docker.md (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

* docs/maintainers/docker.md

--- Thank you for using CodeRabbit. We offer it for free to the OSS community and would appreciate your support in helping us grow. If you find it useful, would you consider giving us a shout-out on your favorite social media?

❤️ Share

- [X](https://twitter.com/intent/tweet?text=I%20just%20used%20%40coderabbitai%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20the%20proprietary%20code.%20Check%20it%20out%3A&url=https%3A//coderabbit.ai) - [Mastodon](https://mastodon.social/share?text=I%20just%20used%20%40coderabbitai%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20the%20proprietary%20code.%20Check%20it%20out%3A%20https%3A%2F%2Fcoderabbit.ai) - [Reddit](https://www.reddit.com/submit?title=Great%20tool%20for%20code%20review%20-%20CodeRabbit&text=I%20just%20used%20CodeRabbit%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20proprietary%20code.%20Check%20it%20out%3A%20https%3A//coderabbit.ai) - [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fcoderabbit.ai&mini=true&title=Great%20tool%20for%20code%20review%20-%20CodeRabbit&summary=I%20just%20used%20CodeRabbit%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20proprietary%20code)

🪧 Tips

### Chat There are 3 ways to chat with [CodeRabbit](https://coderabbit.ai): > ‼️ **IMPORTANT** > Auto-reply has been disabled for this repository in the CodeRabbit settings. The CodeRabbit bot will not respond to your replies unless it is explicitly tagged. - Files and specific lines of code (under the "Files changed" tab): Tag `@coderabbitai` in a new review comment at the desired location with your query. Examples: - `@coderabbitai generate unit testing code for this file.` - `@coderabbitai modularize this function.` - PR comments: Tag `@coderabbitai` in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples: - `@coderabbitai gather interesting stats about this repository and render them as a table. Additionally, render a pie chart showing the language distribution in the codebase.` - `@coderabbitai read src/utils.ts and generate unit testing code.` - `@coderabbitai read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.` - `@coderabbitai help me debug CodeRabbit configuration file.` Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments. ### CodeRabbit Commands (Invoked using PR comments) - `@coderabbitai pause` to pause the reviews on a PR. - `@coderabbitai resume` to resume the paused reviews. - `@coderabbitai review` to trigger an incremental review. This is useful when automatic reviews are disabled for the repository. - `@coderabbitai full review` to do a full review from scratch and review all the files again. - `@coderabbitai summary` to regenerate the summary of the PR. - `@coderabbitai resolve` resolve all the CodeRabbit review comments. - `@coderabbitai configuration` to show the current CodeRabbit configuration for the repository. - `@coderabbitai help` to get help. ### Other keywords and placeholders - Add `@coderabbitai ignore` anywhere in the PR description to prevent this PR from being reviewed. - Add `@coderabbitai summary` to generate the high-level summary at a specific location in the PR description. - Add `@coderabbitai` anywhere in the PR title to generate the title automatically. ### Documentation and Community - Visit our [Documentation](https://coderabbit.ai/docs) for detailed information on how to use CodeRabbit. - Join our [Discord Community](http://discord.gg/coderabbit) to get help, request features, and share feedback. - Follow us on [X/Twitter](https://twitter.com/coderabbitai) for updates and announcements.

[rootulp]

The steps currently publish just the celestia-app Docker image b/c

docker buildx build --platform linux/amd64,linux/arm64 -t ghcr.io/celestiaorg/celestia-app:v2.2.0-mocha --push .

but I think this command could be slightly modified to build the txsim docker image and push it