Add CI workflow

.github/workflows/ci.yml

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+name: eShop Workshop CI
+
+on:
+  push:
+    branches: [main]
+    paths-ignore:
+      - "**/*.md"
+      - "**/*.gitignore"
+      - "**/*.gitattributes"
+
+  pull_request:
+    paths-ignore:
+      - "**/*.md"
+      - "**/*.gitignore"
+      - "**/*.gitattributes"
+
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    name: Build Repo
+    env:
+      DOTNET_CLI_TELEMETRY_OPTOUT: true
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Install .NET SDK
+      uses: actions/setup-dotnet@v3
+      with:
+        global-json-file: ${{ matrix.os == 'ubuntu-latest' && './global.json' || '.\global.json' }}
+
+    - name: Build
+      run: ${{ matrix.os == 'ubuntu-latest' && './build.sh' || '.\build.cmd' }}

build.cmd

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+@ECHO OFF
+
+dotnet workload update --skip-sign-check --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet8/nuget/v3/index.json
+dotnet workload install aspire --skip-sign-check --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet8/nuget/v3/index.json
+
+dotnet build .\build\Build.proj

build.sh

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+#!/usr/bin/env bash
+
+dotnet workload update --skip-sign-check --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet8/nuget/v3/index.json
+dotnet workload install aspire --skip-sign-check --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet8/nuget/v3/index.json
+
+dotnet build ./build/Build.proj

build/Build.proj

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+<Project Sdk="Microsoft.Build.NoTargets/3.7.0">
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <RepoSlns Include="$(MSBuildThisFileDirectory)../*.sln" />
+        <AppHostProjects Include="$(MSBuildThisFileDirectory)../src/**/*.AppHost/*.AppHost.csproj" />
+    </ItemGroup>
+
+    <Target Name="BuildRepoSlns" BeforeTargets="Build">
+        <Message Text="Building @(RepoSlns->Count()) solutions" Importance="High" />
+
+        <MSBuild Projects="@(RepoSlns)" Targets="Restore" />
+        <MSBuild Projects="@(RepoSlns)" Targets="Build" BuildInParallel="True" />
+
+        <Message Text="@(RepoSlns->Count()) solutions successfully built" Importance="High" />
+    </Target>
+
+    <!-- <Target Name="PublishRepoSlns" AfterTargets="BuildRepoSlns">
+        <Message Text="Publishing @(RepoSlns->Count()) solutions" Importance="High" />
+
+        <MSBuild Projects="@(RepoSlns)" Targets="Restore" />
+        <MSBuild Projects="@(RepoSlns)" Targets="Publish" BuildInParallel="True" />
+
+        <Message Text="@(RepoSlns->Count()) solutions successfully published" Importance="High" />
+    </Target> -->
+
+    <Target Name="GenerateAppHostManifests" AfterTargets="PublishRepoSlns">
+        <Message Text="Generating manifests for @(AppHostProjects->Count()) AppHost projects" Importance="High" />
+
+        <MSBuild Projects="@(AppHostProjects)" Targets="GenerateAspireManifest" BuildInParallel="True">
+            <Output TaskParameter="TargetOutputs" ItemName="GeneratedManifestFiles" />
+        </MSBuild>
+
+        <Message Text="Generated manifest for '%(GeneratedManifestFiles.MSBuildSourceProjectFile)'" Importance="High" />
+        <Message Text="@(AppHostProjects->Count()) manifests generated" Importance="High" />
+    </Target>
+</Project>