chore: Flathub Integration

[vikingnope]

NOT READY FOR REVIEW

This Pull Request should stay as draft. Still a WORK IN PROGRESS

Pull Request Description

This pull request adds support for automated Flathub packaging and submission for the Fladder project. The main changes include the introduction of a GitHub Actions workflow to update and submit Flathub manifests on release builds, and the addition of the necessary Flathub manifest and metadata files for Fladder.

Flathub packaging and workflow automation:

• Added a new flathub-package-submit job to .github/workflows/build.yml that automatically updates Flathub manifests and creates a pull request to the Flathub repository on each release build. This includes steps for manifest updates, versioning, and metadata handling.

Flathub manifest and metadata files:

• Added a new Flathub manifest file flatpak/nl.jknaapen.fladder.flathub.yaml describing how to build and package Fladder and its dependencies (mpv, zenity, Flutter SDK, etc.) for Flathub.
• Added a new Flathub metainfo file flatpak/nl.jknaapen.fladder.metainfo.xml providing metadata, description, screenshots, and release information for Fladder on Flathub.

Issue Being Fixed

Resolves #390

Screenshots / Recordings

What still needs to be done:

• Verify Flatpak package fully works
• Create Pull Request for first upload of Fladder to Flathub
• Change code to point to correct repo

Checklist

• If a new package was added, did you ensure it works for all supported platforms? Is the package well maintained
• Check that any changes are related to the issue at hand.

[sourcery-ai]

Reviewer's Guide

Automates Flathub packaging and submission by adding a dedicated GitHub Actions job and including the necessary Flatpak manifest and metadata for Fladder.

Entity relationship diagram for new Flathub manifest and metainfo files

erDiagram
  FLATPAK_MANIFEST {
    string id
    string runtime
    string runtime-version
    string sdk
    string command
    list modules
  }
  METAINFO_XML {
    string id
    string name
    string summary
    string description
    list screenshots
    list releases
    list categories
    list keywords
  }
  FLATPAK_MANIFEST ||--|| METAINFO_XML : "references"
  FLATPAK_MANIFEST ||--|{ MODULE : "contains"
  MODULE {
    string name
    string buildsystem
    list sources
  }

Loading

File-Level Changes

Change	Details	Files
Introduce GitHub Actions job for Flathub submission	Add flathub-package-submit job to CI Checkout main and Flathub repos Copy and update manifest and metainfo files Update manifest tag, commit hash, and metainfo version/date Create PR to Flathub repository	.github/workflows/build.yml
Add Flathub Flatpak manifest	Define runtime, SDK, and finish args Include modules for mpv, zenity, Flutter SDK, and Fladder Configure build and cleanup steps for each module	flatpak/nl.jknaapen.fladder.flathub.yaml
Add Flathub application metadata	Provide app description, features list, and screenshots Define release element for versioning Specify categories, keywords, and developer info	flatpak/nl.jknaapen.fladder.metainfo.xml

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