docs: add maintainer release instructions (#4773)

Author: ReenigneArcher

docs/maintainers/README.md

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+# Maintainer Documentation
+
+This directory contains documentation intended for Sunshine maintainers only. These documents cover internal processes,
+workflows, and procedures that are not relevant to end users or general contributors.
+
+## Available Documentation
+
+### [Release Process](release.md)
+Instructions for creating and managing Sunshine releases, including the steps to convert pre-releases to stable releases
+and an overview of the automated workflows that are triggered during the release process.
+
+---
+
+> [!NOTE]
+> These documents are excluded from the public Doxygen documentation build and are intended for internal use only.

docs/maintainers/release.md

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+# Create a stable Sunshine release
+
+Pre-releases in Sunshine are created automatically on every push event to the `master` branch. These are required
+to be created before making a stable release. Below are the instructions for converting a pre-release to stable.
+
+1. Wait for the pre-release to be created.
+2. Once the pre-release is created, the copr build will begin in the
+   [beta copr repo](https://copr.fedorainfracloud.org/coprs/lizardbyte/beta/).
+   Wait for this build to succeed before continuing. You can view the status
+   [here](https://github.com/LizardByte/Sunshine/actions/workflows/ci-copr.yml?query=event%3Arelease)
+3. Once the workflow mentioned in step 2 completes, it will update the GitHub release with the RPM files from the copr
+   build.
+4. At this point, the GitHub release can be edited.
+
+   - Add any top-level release notes.
+   - Ensure any security fixes are mentioned first with links to the security advisories.
+   - Following security advisories, breaking changes should be mentioned. Be sure to mention anything the user may need
+     to do to ensure a smooth upgrade experience.
+   - Then highlight any notable new features and/or fixes.
+   - Lastly, reduce the automated changelog list. Things like dependency updates and ci updates can mostly be removed.
+
+5. When saving, uncheck "pre-release" and save the release. This will make the release stable and kick off a series of
+   workflows, including but not limited to the following:
+
+   - Create a blog post in [LizardByte.github.io repo](https://github.com/LizardByte/LizardByte.github.io/pulls) via PR
+
+     - Merging this PR will trigger automations that send the blog post link to:
+
+       - LizardByte Discord
+       - r/LizardByte subreddit
+       - Twitter
+       - Facebook
+
+   - Update changelog in [changelog](https://github.com/LizardByte/Sunshine/tree/changelog) branch
+   - Update docs on [Read The Docs](https://app.readthedocs.org/projects/sunshinestream/)
+   - Update official [Flathub repo](https://github.com/flathub/dev.lizardbyte.app.Sunshine/pulls) via a PR
+     (we have merge control)
+   - Update our homebrew-homebrew repo via a PR (https://github.com/LizardByte/homebrew-homebrew/pulls)
+   - Update our pacman-repo via a PR (https://github.com/LizardByte/pacman-repo/pulls)
+   - Update official
+     [Winget repo](https://github.com/microsoft/winget-pkgs/issues?q=is%3Apr%20is%3Aopen%20author%3ALizardByte-bot)
+     via a PR (we DO NOT have merge control)
+   - Build the new version in [stable copr repo](https://copr.fedorainfracloud.org/coprs/lizardbyte/stable/)
+   - Send release notification to Moonlight Discord server