Migrate to GitHub CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,106 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+    tags: [ 'v*' ]
+    paths-ignore:
+      - '*.md'
+      - '*.txt'
+      - '.git*'
+  pull_request:
+    branches: [ master ]
+    paths-ignore:
+      - '*.md'
+      - '*.txt'
+      - '.git*'
+
+env:
+  CONFIGURATION: Release
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+  DOTNET_CLI_TELEMETRY_OPTOUT: true
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [windows-2022, ubuntu-22.04]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4
+      with:
+        global-json-file: global.json
+        dotnet-version: '6.0.x'
+
+    - name: Display .NET info
+      run: dotnet --info
+
+    - name: Restore tools
+      run: dotnet tool restore
+
+    - name: Build
+      run: dotnet build --configuration ${{ env.CONFIGURATION }}
+
+    - name: Pack (Windows only)
+      if: runner.os == 'Windows'
+      shell: pwsh
+      run: |
+        $commitTimestamp = git log -1 --format=%cI
+        if ($LASTEXITCODE) { throw "Failed to get commit timestamp" }
+        $versionSuffix = ([datetimeoffset]$commitTimestamp).ToUniversalTime().ToString('yyyyMMdd''t''HHmm')
+
+        $releaseNotesFile = [System.IO.Path]::GetTempFileName()
+        $tag = '${{ github.ref_name }}'
+        $isTag = '${{ github.ref_type }}' -eq 'tag'
+
+        # if the tag starts with "v", as in "v1.0.0", assume it's a release
+        if ($isTag -and $tag -clike 'v*') {
+          $url = '${{ github.server_url }}/${{ github.repository }}'
+          Add-Content $releaseNotesFile -Encoding UTF8 "See: ${url}/releases/tag/$tag"
+          Add-Content $releaseNotesFile -Encoding UTF8 ''
+          # if tag ends in "-" followed by dot-separated identifiers...
+          if ($tag -match '(?<=-)[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*$') {
+            $versionSuffix = $matches[0] # ...then use as suffix for pre-release
+          } else {
+            $versionSuffix = $null       # ... else use no suffix for a release
+          }
+        }
+
+        Add-Content $releaseNotesFile -Encoding UTF8 "Commit @ ${{ github.sha }}"
+        $packArgs = @()
+        if ($versionSuffix) {
+          $packArgs += @('--version-suffix', $versionSuffix)
+        }
+        dotnet pack --no-build --configuration ${{ env.CONFIGURATION }} @packArgs "-p:PackageReleaseNotesFile=$releaseNotesFile"
+        if ($LASTEXITCODE) { throw "Pack failed" }
+
+        Get-ChildItem -File -Filter docopt.net.*.nupkg dist |
+          Select-Object -ExpandProperty FullName |
+          ForEach-Object { dotnet sourcelink test $_; if ($LASTEXITCODE) { throw "SourceLink test failed for $_" } }
+
+    - name: Test
+      run: dotnet test --no-build --configuration ${{ env.CONFIGURATION }}
+
+    - name: Integration Tests (Windows)
+      if: runner.os == 'Windows'
+      shell: pwsh
+      run: ./tests/Integration/run.ps1 -NoPack
+
+    - name: Integration Tests (Linux)
+      if: runner.os == 'Linux'
+      shell: pwsh
+      run: ./tests/Integration/run.ps1
+
+    - name: Upload NuGet packages
+      if: runner.os == 'Windows'
+      uses: actions/upload-artifact@v4
+      with:
+        name: NuGet
+        path: dist/*.nupkg