Add release GitHub workflow

Author: jjonescz

.github/workflows/release.yml

@@ -0,0 +1,18 @@
+name: Release
+
+on:
+  push:
+    tags: [v*]
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Run release script
+        shell: pwsh
+        run: ./eng/release.ps1
+        env:
+          NUGET_API_KEY: ${{ secrets.NUGET_API_KEY }}

README.md

@@ -92,11 +92,6 @@ This library is also used in production by [KnowledgePicker](https://knowledgepi
 
 As mentioned [above](#how-to-use), only subset of functionality is implemented now, but all contributions are welcome. Feel free to open [issues](https://github.com/knowledgepicker/word-cloud/issues) and [pull requests](https://github.com/knowledgepicker/word-cloud/pulls).
 
-### Creating NuGet package
+### Release process
 
-Until we have a CI pipeline, this is how we release new version of the package (don't forget to replace 1.0.0 with the correct version):
-
-```bash
-cd src/KnowledgePicker.WordCloud
-dotnet pack -c Release --include-symbols --include-source -p:PackageVersion=1.0.0
-```
+After pushing a tag, GitHub workflow `release.yml` is triggered which builds and publishes the NuGet package.

eng/release.ps1

@@ -0,0 +1,27 @@
+Set-StrictMode -version 2.0
+$ErrorActionPreference = "Stop"
+
+Write-Output "Working directory: $pwd"
+
+# Load current Git tag.
+$tag = $(git describe --tags)
+Write-Output "Tag: $tag"
+
+# Parse tag into a three-number version.
+$version = $tag.Split('-')[0].TrimStart('v')
+Write-Output "Version: $version"
+
+Push-Location src/KnowledgePicker.WordCloud
+try {
+    # Pack the library.
+    dotnet pack -c Release --include-symbols --include-source `
+        -p:PackageVersion=$version
+
+    # Push the NuGet package.
+    dotnet nuget push `
+        "bin/Release/KnowledgePicker.WordCloud.$version.symbols.nupkg" `
+        --source https://api.nuget.org/v3/index.json `
+        --api-key $env:NUGET_API_KEY
+} finally {
+    Pop-Location
+}