Add Flatpak support (#203)

* Make a flatpak manifest, the permissions are not set properly.

* Move to separate flatpak dir

* Rewrite in yaml

* Update sources

* Update flatpak to 2.3.0

* Remove PulseAudio support

* Add metainfo file

* Use the right files

* Update metadata file

* Polish manifest and improve metadata

* Improve metadata

* Switch to metainfo

* Fix version number

Co-authored-by: Lionir <git@thelion.website>

flatpak/com.github.qarmin.Czkawka.metainfo.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>com.github.qarmin.Czkawka</id>
+  <name>Czkawka</name>
+  <summary>Multi functional app to find duplicates, empty folders, similar images etc.</summary>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>MIT</project_license>
+  <description>
+    <p>
+      Czkawka is written in Rust, simple, fast and easy to use app to remove unnecessary files from your computer.
+    </p>
+  </description>
+  <launchable type="desktop-id">com.github.qarmin.Czkawka.desktop</launchable>
+  <screenshots>
+    <screenshot type="default">
+      <image>https://user-images.githubusercontent.com/41945903/104711404-9cbb7400-5721-11eb-904d-9677c189f7ab.gif</image>
+    </screenshot>
+  </screenshots>
+  <releases>
+    <release version="2.3.0" date="2021-01-15"/>
+  </releases>
+  <content_rating type="oars-1.0"/>
+  <developer_name>Rafał Mikrut</developer_name>
+  <url type="homepage">https://github.com/qarmin/czkawka</url>
+  <url type="bugtracker">https://github.com/qarmin/czkawka/issues</url>
+  <url type="donation">https://github.com/sponsors/qarmin</url>
+</component>

flatpak/com.github.qarmin.Czkawka.yaml

@@ -0,0 +1,36 @@
+app-id: com.github.qarmin.Czkawka
+runtime: org.gnome.Platform
+runtime-version: '3.38'
+sdk: org.gnome.Sdk
+sdk-extensions:
+- org.freedesktop.Sdk.Extension.rust-stable
+command: czkawka_gui
+rename-icon: com.github.qarmin.czkawka
+rename-desktop-file: com.github.qarmin.czkawka.desktop
+finish-args:
+- "--share=ipc"
+- "--socket=fallback-x11"
+- "--socket=wayland"
+- "--filesystem=host"
+- "--device=dri"
+build-options:
+  append-path: "/usr/lib/sdk/rust-stable/bin"
+  env:
+    CARGO_HOME: "/run/build/czkawka_gui/cargo"
+modules:
+- name: czkawka_gui
+  buildsystem: simple
+  build-commands:
+  - cargo --offline fetch --manifest-path Cargo.toml
+  - cargo --offline build --release
+  - install -Dm755 ./target/release/czkawka_gui -t /app/bin/
+  - install -Dm644 ./data/icons/com.github.qarmin.czkawka.svg -t /app/share/icons/hicolor/scalable/apps/
+  - install -Dm644 ./pkgs/com.github.qarmin.czkawka.desktop -t /app/share/applications/
+  - install -Dm644 ./flatpak/com.github.qarmin.Czkawka.metainfo.xml -t /app/share/metainfo
+  sources:
+  - type: dir
+    path: "."
+  - cargo-sources.json
+  - type: git
+    url: https://github.com/qarmin/czkawka.git
+    tag: 2.3.0