Add flatpak building (#172)

.github/workflows/flatpak-build.yaml

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+name: Flatpak Build
+
+on:
+  push:
+    branches: 
+      - master
+      # TODO: remove
+      - flatpak
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: bilelmoussaoui/flatpak-github-actions:gnome-42
+      options: --privileged
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - name: Build Flatpak bundle
+        uses: flatpak/flatpak-github-actions/flatpak-builder@v6
+        with:
+          bundle: overlayed.flatpak
+          manifest-path: distribution/dev.overlayed.Overlayed.yaml
+          cache-key: flatpak-builder-${{ github.ref }}

distribution/dev.overlayed.Overlayed.desktop

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+
+[Desktop Entry]
+Name=Overlayed
+Comment=A Discord overlay for Linux
+Exec=overlayed
+Icon=dev.overlayed.Overlayed
+Type=Application
+Terminal=false
+StartupNotify=true
+Categories=Game;
+Keywords=discord;
+StartupWMClass=Overlayed
+Version=1.4

distribution/dev.overlayed.Overlayed.metainfo.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop">
+  <id>com.overlayed.Overlayed</id>
+  <launchable type="desktop-id">com.overlayed.Overlayed.desktop</launchable>
+  <name>Overlayed</name>
+  <developer_name>Team Overlayed</developer_name>
+  <summary>A discord overlay</summary>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-3.0-only</project_license>
+  <url type="homepage">https://overlayed.dev</url>
+  <url type="bugtracker">https://github.com/overlayeddev/overlayed/issues</url>
+  <url type="vcs-browser">https://github.com/overlayeddev/overlayed</url>
+  <url type="contribute">https://github.com/overlayeddev/overlayed</url>
+  <description>
+    <p>See who's speaking in your Discord voice channel with a movable overlay, compatible with almost every game or app.</p>
+    <ul>
+      <li>User List - See who is speaking, muted, and deafened in the current voice channel</li>⋅
+      <li>Pinnable - Always stays on top so you can continue working or gaming</li>
+      <li>Transparent - Transparent window that can ignore mouse clicks</li>
+      <li>Join History - See who enters and leaves a channel</li>
+    </ul>
+  </description>
+  <screenshots>
+    <screenshot type="default">
+      <caption>The home screen of the app</caption>
+      <image>https://assets.overlayed.dev/appdir/pres/slide1.png</image>
+    </screenshot>
+  </screenshots>
+  <releases>
+    <release version="0.6.3" date="2023-12-14" type="stable">
+      <url>https://github.com/overlayeddev/overlayed/releases/tag/v0.5.0</url>
+    </release>
+  </releases>
+  <content_rating type="oars-1.1">
+    <content_attribute id="violence-fantasy">moderate</content_attribute>
+    <content_attribute id="social-chat">intense</content_attribute>
+  </content_rating>
+</component>

distribution/dev.overlayed.Overlayed.yaml

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+id: dev.overlayed.Overlayed
+
+runtime: org.gnome.Platform
+runtime-version: "45"
+sdk: org.gnome.Sdk
+
+rename-icon: overlayed
+command: overlayed
+finish-args:
+  # NOTE: not sure if this is for both IPC and Websockets transports
+  - --filesystem=xdg-run/app/com.discordapp.Discord:create # allows for discord rpc
+  - --device=all
+  - --share=ipc
+  - --share=network
+  - --socket=x11
+  - --socket=wayland
+
+modules:
+  - name: overlayed
+    buildsystem: simple
+    build-commands:
+      - chmod +x Overlayed.AppImage
+      - ./Overlayed.AppImage --appimage-extract
+
+      - |
+        desktop-file-edit \
+          --set-name="Overlayed App" \
+          --set-comment="Overlayed's game launcher" \
+          --set-icon="$FLATPAK_ID" \
+          --set-key="StartupNotify" --set-value="true" \
+          --set-key="Categories" --set-value="Game;ActionGame;AdventureGame;Simulation;" \
+          --set-key="Keywords" --set-value="game;minecraft;mc;" \
+          --set-key="StartupWMClass" --set-value="Overlayed" \
+          squashfs-root/usr/share/applications/overlayed.desktop
+
+      - mkdir -p /app/{bin,share}
+      - cp -r squashfs-root/usr/share/icons /app/share/icons
+      - install -Dm755 squashfs-root/usr/bin/overlayed /app/bin/overlayed
+      - install -Dm644 squashfs-root/usr/share/applications/overlayed.desktop /app/share/applications/dev.overlayed.Overlayed.desktop
+      - install -Dm644 dev.overlayed.Overlayed.metainfo.xml /app/share/metainfo/dev.overlayed.OverlayedApp.metainfo.xml
+
+    sources:
+      - type: file
+        path: dev.overlayed.Overlayed.metainfo.xml
+
+      - type: file
+        url: https://github.com/overlayeddev/overlayed/releases/download/v0.5.0/overlayed_0.5.0_amd64.AppImage
+        dest-filename: Overlayed.AppImage
+        sha256: bbcc773e89ba6cdbf4b3e91156b2702b2a82a91b5df7a8bbd2e274d5104a9725
+        only-arches: [x86_64]