gh: Build linux x86 desktop app (#421)

* gha: tauri action args

* gha: remove windows

.github/workflows/on-tag.yaml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        platform: [macos-latest, ubuntu-20.04, windows-latest]
+        platform: [macos-latest, ubuntu-20.04]
 
     runs-on: ${{ matrix.platform }}
 
@@ -27,7 +27,6 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y libgtk-3-dev libwebkit2gtk-4.0-dev libappindicator3-dev librsvg2-dev patchelf
-          rustup target add aarch64-unknown-linux-gnu
 
       - name: Install missing Rust target for universal Mac build
         if: matrix.platform == 'macos-latest'
@@ -102,8 +101,7 @@ jobs:
           releaseDraft: false
           includeDebug: true
           updaterJsonKeepUniversal: true
-          args: '--target universal-apple-darwin'
-
+          args: ${{matrix.platform == 'ubuntu-20.04' && '--target x86_64-unknown-linux-gnu' || '--target universal-apple-darwin'}}
       # Commit package.json, tauri.conf.json and Cargo.toml to master
       - name: Commit & Push
         run: |