chore(ci): add flatpak build (#398)

* chore(ci): add flatpak build

* fmt changelog

.github/workflows/build-gui-release-binaries.yml

@@ -21,7 +21,7 @@ jobs:
           - platform: "macos-13" # for Intel based macs.
             args: "--target x86_64-apple-darwin"
           - platform: "ubuntu-24.04" # We build on an older version to support older glib versions
-            args: ""
+            args: "--bundles deb,appimage,flatpak"
           - platform: "windows-latest"
             args: ""
 
@@ -57,6 +57,7 @@ jobs:
             librsvg2-dev;
 
           sudo apt install -y \
+            flatpak flatpak-builder \
             libwebkit2gtk-4.1-0=2.44.0-2 \
             libwebkit2gtk-4.1-dev=2.44.0-2 \
             libjavascriptcoregtk-4.1-0=2.44.0-2 \
@@ -64,6 +65,14 @@ jobs:
             gir1.2-javascriptcoregtk-4.1=2.44.0-2 \
             gir1.2-webkit2-4.1=2.44.0-2;
 
+      - name: prepare flatpak runtime
+        if: matrix.platform == 'ubuntu-24.04'
+        run: |
+          flatpak --version
+          flatpak remote-add --if-not-exists flathub \
+            https://dl.flathub.org/repo/flathub.flatpakrepo
+          flatpak update -y
+
       - name: work around spurious network errors in curl 8.0
         shell: bash
         run: |

CHANGELOG.md

@@ -7,7 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-- docs: add instructions for verifying Tauri signature files
+- GUI: Build Flatpak bundle in release workflow
+- docs: Instructions for verifying GUI (Tauri) signature files
 
 ## [2.0.0-beta.2] - 2025-06-11
 

src-tauri/tauri.conf.json

@@ -29,7 +29,22 @@
   "bundle": {
     "createUpdaterArtifacts": true,
     "active": true,
-    "targets": ["appimage", "dmg", "nsis", "app", "deb"],
+    "targets": ["appimage", "flatpak", "dmg", "nsis", "app", "deb"],
+
+    /* Flatpak-specific settings
+     * These are ignored by the other targets. */
+    "flatpak": {
+      "id": "net.unstoppableswap.UnstoppableSwap",
+      "runtime": "org.freedesktop.Platform",
+      "sdk": "org.freedesktop.Sdk",
+      "runtimeVersion": "23.08",
+      "finishArgs": [
+        "--socket=wayland",
+        "--socket=x11",
+        "--share=network",
+        "--device=all"
+      ]
+    },
     "icon": [
       "icons/32x32.png",
       "icons/128x128.png",