ci: add build-samples workflow for Phase 1 low-workload samples

.github/workflows/build-samples-datasync-server-cosmosdb.yml

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+name: Build Sample - Datasync Server (Cosmos DB)
+
+on:
+  workflow_call:
+
+env:
+  DOTNET_VERSION: '10.0.x'
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+  DOTNET_NOLOGO: true
+  DOTNET_CONFIGURATION: 'Release'
+  SolutionFile: 'samples/datasync-server-cosmosdb-singlecontainer/Datasync.Server.CosmosDb.SingleContainer.sln'
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Restore dependencies
+        run: dotnet restore ${{ env.SolutionFile }}
+
+      - name: Build sample
+        run: >
+          dotnet build ${{ env.SolutionFile }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore

.github/workflows/build-samples-datasync-server.yml

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+name: Build Sample - Datasync Server
+
+on:
+  workflow_call:
+
+env:
+  DOTNET_VERSION: '10.0.x'
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+  DOTNET_NOLOGO: true
+  DOTNET_CONFIGURATION: 'Release'
+  SolutionFile: 'samples/datasync-server/Sample.Datasync.Server.sln'
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Restore dependencies
+        run: dotnet restore ${{ env.SolutionFile }}
+
+      - name: Build sample
+        run: >
+          dotnet build ${{ env.SolutionFile }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore

.github/workflows/build-samples-todoapp-avalonia.yml

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+name: Build Sample - TodoApp Avalonia
+
+on:
+  workflow_call:
+
+env:
+  DOTNET_VERSION: '10.0.x'
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+  DOTNET_NOLOGO: true
+  DOTNET_CONFIGURATION: 'Release'
+  # NOTE: This sample's solution (TodoApp.Avalonia.sln) also contains Android and iOS
+  # heads (net10.0-android / net10.0-ios), which require mobile workloads and are tracked
+  # separately in https://github.com/CommunityToolkit/Datasync/issues/511 (Phase 3). Only
+  # the shared and Desktop (net10.0) projects are built directly here, not the full .sln.
+  SharedProjectFile: 'samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia/TodoApp.Avalonia.csproj'
+  DesktopProjectFile: 'samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia.Desktop/TodoApp.Avalonia.Desktop.csproj'
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Restore shared project
+        run: dotnet restore ${{ env.SharedProjectFile }}
+
+      - name: Build shared project
+        run: >
+          dotnet build ${{ env.SharedProjectFile }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
+
+      - name: Restore desktop project
+        run: dotnet restore ${{ env.DesktopProjectFile }}
+
+      - name: Build desktop project
+        run: >
+          dotnet build ${{ env.DesktopProjectFile }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore

.github/workflows/build-samples-todoapp-blazor-wasm.yml

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+name: Build Sample - TodoApp Blazor WASM
+
+on:
+  workflow_call:
+
+env:
+  DOTNET_VERSION: '10.0.x'
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+  DOTNET_NOLOGO: true
+  DOTNET_CONFIGURATION: 'Release'
+  SolutionFile: 'samples/todoapp-blazor-wasm/TodoApp.BlazorWasm.sln'
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Restore dependencies
+        run: dotnet restore ${{ env.SolutionFile }}
+
+      - name: Build sample
+        run: >
+          dotnet build ${{ env.SolutionFile }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore

.github/workflows/build-samples-todoapp-mvc.yml

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+name: Build Sample - TodoApp MVC
+
+on:
+  workflow_call:
+
+env:
+  DOTNET_VERSION: '10.0.x'
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+  DOTNET_NOLOGO: true
+  DOTNET_CONFIGURATION: 'Release'
+  SolutionFile: 'samples/todoapp-mvc/part5.sln'
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Restore dependencies
+        run: dotnet restore ${{ env.SolutionFile }}
+
+      - name: Build sample
+        run: >
+          dotnet build ${{ env.SolutionFile }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore

.github/workflows/build-samples-todoapp-tutorial.yml

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+name: Build Sample - TodoApp Tutorial
+
+on:
+  workflow_call:
+
+env:
+  DOTNET_VERSION: '10.0.x'
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+  DOTNET_NOLOGO: true
+  DOTNET_CONFIGURATION: 'Release'
+  # NOTE: This sample's solution (todoapp.sln) also contains ClientApp, a WPF project
+  # targeting net10.0-windows. That head requires a windows-latest runner and is tracked
+  # separately in https://github.com/CommunityToolkit/Datasync/issues/510 (Phase 2). Only
+  # ServerApp (net10.0) is built here.
+  ProjectFile: 'samples/todoapp-tutorial/ServerApp/ServerApp.csproj'
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Restore dependencies
+        run: dotnet restore ${{ env.ProjectFile }}
+
+      - name: Build sample
+        run: >
+          dotnet build ${{ env.ProjectFile }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore

.github/workflows/build-samples.yml

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+name: Build Samples
+
+on:
+  push:
+    branches: [ main ]
+    paths: [ 'samples/**', '.github/workflows/build-samples*.yml' ]
+  pull_request:
+    branches: [ main ]
+    paths: [ 'samples/**', '.github/workflows/build-samples*.yml' ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  datasync-server:
+    uses: ./.github/workflows/build-samples-datasync-server.yml
+
+  datasync-server-cosmosdb:
+    uses: ./.github/workflows/build-samples-datasync-server-cosmosdb.yml
+
+  todoapp-mvc:
+    uses: ./.github/workflows/build-samples-todoapp-mvc.yml
+
+  todoapp-blazor-wasm:
+    uses: ./.github/workflows/build-samples-todoapp-blazor-wasm.yml
+
+  todoapp-tutorial:
+    uses: ./.github/workflows/build-samples-todoapp-tutorial.yml
+
+  todoapp-avalonia:
+    uses: ./.github/workflows/build-samples-todoapp-avalonia.yml
+
+  # Single aggregation point so branch protection only needs to require one check,
+  # regardless of how many sample workflows are added over time (see Phase 2/3
+  # follow-ups: https://github.com/CommunityToolkit/Datasync/issues/510 and #511).
+  all-samples-built:
+    name: All samples built
+    if: always()
+    needs:
+      - datasync-server
+      - datasync-server-cosmosdb
+      - todoapp-mvc
+      - todoapp-blazor-wasm
+      - todoapp-tutorial
+      - todoapp-avalonia
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check sample build results
+        run: |
+          if [ "${{ contains(needs.*.result, 'failure') }}" = "true" ] || [ "${{ contains(needs.*.result, 'cancelled') }}" = "true" ]; then
+            echo "One or more sample builds failed."
+            exit 1
+          fi
+          echo "All samples built successfully."