fix(launcher): close LA4 review findings

.github/workflows/headless-portability.yml

@@ -7,6 +7,7 @@ on:
       - "AcDream.slnx"
       - "src/AcDream.Platform/**"
       - "src/AcDream.Launcher.Core/**"
+      - "src/AcDream.Launcher/**"
       - "src/AcDream.Core/**"
       - "src/AcDream.Core.Net/**"
       - "src/AcDream.Content/**"
@@ -17,6 +18,7 @@ on:
       - "src/AcDream.UI.Abstractions/**"
       - "tests/AcDream.Platform.Tests/**"
       - "tests/AcDream.Launcher.Core.Tests/**"
+      - "tests/AcDream.Launcher.Tests/**"
       - "tests/AcDream.Core.Tests/**"
       - "tests/AcDream.Core.Net.Tests/**"
       - "tests/AcDream.Content.Tests/**"
@@ -33,6 +35,7 @@ on:
       - "AcDream.slnx"
       - "src/AcDream.Platform/**"
       - "src/AcDream.Launcher.Core/**"
+      - "src/AcDream.Launcher/**"
       - "src/AcDream.Core/**"
       - "src/AcDream.Core.Net/**"
       - "src/AcDream.Content/**"
@@ -43,6 +46,7 @@ on:
       - "src/AcDream.UI.Abstractions/**"
       - "tests/AcDream.Platform.Tests/**"
       - "tests/AcDream.Launcher.Core.Tests/**"
+      - "tests/AcDream.Launcher.Tests/**"
       - "tests/AcDream.Core.Tests/**"
       - "tests/AcDream.Core.Net.Tests/**"
       - "tests/AcDream.Content.Tests/**"
@@ -131,6 +135,59 @@ jobs:
           dotnet run --project src/AcDream.Headless/AcDream.Headless.csproj -c Release -- validate --config headless-k0.json
           if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
 
+  portable-launcher:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Install .NET 10
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: "10.0.x"
+
+      - name: Build and test the portable launcher
+        shell: pwsh
+        run: |
+          dotnet build src/AcDream.Launcher/AcDream.Launcher.csproj -c Release
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+          dotnet test tests/AcDream.Launcher.Tests/AcDream.Launcher.Tests.csproj -c Release
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+
+      - name: Publish the self-contained Linux launcher
+        if: runner.os == 'Linux'
+        shell: pwsh
+        run: |
+          dotnet publish src/AcDream.Launcher/AcDream.Launcher.csproj `
+            -c Release `
+            -r linux-x64 `
+            -o artifacts/acdream-launcher-linux-x64
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+
+      - name: Verify self-contained property and artifact execution
+        if: runner.os == 'Linux'
+        shell: bash
+        run: |
+          set -euo pipefail
+          root=artifacts/acdream-launcher-linux-x64
+          self_contained=$(dotnet msbuild \
+            src/AcDream.Launcher/AcDream.Launcher.csproj \
+            -nologo \
+            -property:RuntimeIdentifier=linux-x64 \
+            -getProperty:SelfContained | tr -d '\r\n ')
+          test "$self_contained" = true
+          test -x "$root/acdream-launcher"
+          test ! -f "$root/acdream-launcher.dll"
+          DOTNET_ROOT=/definitely-not-installed \
+          DOTNET_ROOT_X64=/definitely-not-installed \
+          DOTNET_MULTILEVEL_LOOKUP=0 \
+            "$root/acdream-launcher" --verify-publish
+
   linux-graphical:
     runs-on: ubuntu-latest