Add CI workflow for GitHub actions

.github/workflows/ci.yml

@@ -0,0 +1,99 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+
+  build-nuget:
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.id != github.event.pull_request.base.repo.id
+    name: Build NuGet package
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Setup .NET SDK
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 7.0.x
+    - name: Build project
+      run: dotnet build src/SemanticVersioning --configuration=Release
+    - name: Build NuGet package
+      run: dotnet pack src/SemanticVersioning --configuration=Release --no-build --output nuget
+    - name: Upload NuGet artifact
+      uses: actions/upload-artifact@v3
+      with:
+        name: nuget-package
+        path: nuget
+
+  test-nuget:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        dotnet: [net6.0, net7.0]
+        include:
+        - os: windows-latest
+          dotnet: net472
+      fail-fast: false
+    name: Test NuGet package (${{ matrix.dotnet }} on ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    needs: build-nuget
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Get version
+      id: get-version
+      run: echo "version=$((Select-Xml -Path ./src/SemanticVersioning/SemanticVersioning.csproj -XPath '/Project/PropertyGroup/Version/text()').node.Value)" >> $env:GITHUB_OUTPUT
+      shell: pwsh
+    - name: Download NuGet artifact
+      uses: actions/download-artifact@v3
+      with:
+        name: nuget-package
+        path: nuget
+    - name: Setup .NET 6 SDK
+      if: matrix.dotnet == 'net6.0'
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 6.0.x
+    - name: Setup .NET 7 SDK
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 7.0.x
+    - name: Add local NuGet feed
+      run: |
+        dotnet new nugetconfig
+        dotnet nuget add source -n local $PWD/nuget
+    - name: Change test project references to use local NuGet package
+      run: |
+        dotnet remove test/SemanticVersioning.Tests reference src/SemanticVersioning/SemanticVersioning.csproj
+        dotnet add test/SemanticVersioning.Tests package SemanticVersioning -v ${{ steps.get-version.outputs.version }}
+    - name: Build & Run .NET unit tests
+      run: dotnet test test/SemanticVersioning.Tests --configuration=Release --framework ${{ matrix.dotnet }}
+
+  publish-release:
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/') && !github.event.repository.fork
+    name: Publish release
+    runs-on: ubuntu-latest
+    needs: test-nuget
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Check version
+      id: check-version
+      shell: pwsh
+      run: |
+        $version = (Select-Xml -Path ./src/SemanticVersioning/SemanticVersioning.csproj -XPath '/Project/PropertyGroup/Version/text()').node.Value
+        $tag = "${{ github.ref }}".SubString(10)
+        if (-not ($tag -eq $version)) {
+          echo "::error ::There is a mismatch between the project version ($version) and the tag ($tag)"
+          exit 1
+        }
+        echo "version=$version" >> $env:GITHUB_OUTPUT
+    - name: Download NuGet artifact
+      uses: actions/download-artifact@v3
+      with:
+        name: nuget-package
+        path: nuget
+    - name: Publish to NuGet
+      run: dotnet nuget push nuget/SemanticVersioning.${{ steps.check-version.outputs.version }}.nupkg --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json

test/SemanticVersioning.Tests/SemanticVersioning.Tests.csproj

@@ -1,9 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
     <AssemblyName>SemanticVersioning.Tests</AssemblyName>
     <PackageId>SemanticVersioning.Tests</PackageId>
+    <TargetFrameworks>net6.0;net7.0</TargetFrameworks>
+    <TargetFrameworks Condition="'$(OS)'=='Windows_NT'">$(TargetFrameworks);net472</TargetFrameworks>
     <AssemblyOriginatorKeyFile>..\..\build\semver-key.snk</AssemblyOriginatorKeyFile>
     <SignAssembly>true</SignAssembly>
   </PropertyGroup>