refactor(ci): simplify CI workflow to Linux-only builds

Remove Windows and macOS build jobs from CI workflow since this is a Linux-specific MAUI implementation. Consolidate artifact uploads to single "nuget-packages" artifact.

Fix release workflow to use Gitea-specific variables (GITEA_REF, gitea.repository_owner) instead of GitHub equivalents, and use GITEATOKEN secret for package publishing.

.gitea/workflows/ci.yml

@@ -35,57 +35,5 @@ jobs:
       - name: Upload NuGet packages
         uses: actions/upload-artifact@v3
         with:
-          name: nuget-packages-linux
-          path: ./nupkg/*.nupkg
-
-  build-windows:
-    name: Build (Windows)
-    runs-on: windows-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Restore dependencies
-        run: dotnet restore
-
-      - name: Build
-        run: dotnet build --configuration Release --no-restore
-
-      - name: Run tests
-        run: dotnet test --configuration Release --no-build --verbosity normal
-        continue-on-error: true
-
-      - name: Pack NuGet
-        run: dotnet pack --configuration Release --no-build -o ./nupkg
-
-      - name: Upload NuGet packages
-        uses: actions/upload-artifact@v3
-        with:
-          name: nuget-packages-windows
-          path: ./nupkg/*.nupkg
-
-  build-macos:
-    name: Build (macOS)
-    runs-on: macos-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Restore dependencies
-        run: dotnet restore
-
-      - name: Build
-        run: dotnet build --configuration Release --no-restore
-
-      - name: Run tests
-        run: dotnet test --configuration Release --no-build --verbosity normal
-        continue-on-error: true
-
-      - name: Pack NuGet
-        run: dotnet pack --configuration Release --no-build -o ./nupkg
-
-      - name: Upload NuGet packages
-        uses: actions/upload-artifact@v3
-        with:
-          name: nuget-packages-macos
+          name: nuget-packages
           path: ./nupkg/*.nupkg

.gitea/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Get version from tag
         id: version
         run: |
-          VERSION=${GITHUB_REF#refs/tags/v}
+          VERSION=${GITEA_REF#refs/tags/v}
           echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
           echo "Building version: $VERSION"
 
@@ -50,8 +50,8 @@ jobs:
         run: |
           for pkg in ./nupkg/*.nupkg; do
             dotnet nuget push "$pkg" \
-              --api-key ${{ secrets.GITHUB_TOKEN }} \
-              --source https://git.marketally.com/api/packages/${{ github.repository_owner }}/nuget/index.json \
+              --api-key ${{ secrets.GITEATOKEN }} \
+              --source https://git.marketally.com/api/packages/${{ gitea.repository_owner }}/nuget/index.json \
               --skip-duplicate
           done