build: Support manually generating C# bindings via Github action and add a README (microsoft#423)

Author: dekomissMSFT

.github/workflows/test-csharp.yml

@@ -1,6 +1,7 @@
 name: bindings/csharp
 
 on:
+  workflow_dispatch:
   push:
     branches: [ "main" ]
   pull_request:
@@ -9,6 +10,9 @@ on:
     # Run at 8:00 AM every day
     - cron: "0 8 * * *"
 
+env:
+  VersionSuffix: ${{ github.event_name == 'workflow_dispatch' && 'manualtrigger' || null }}
+
 jobs:  
   build-ffi:
     name: 'Build Regorus FFI: (${{ matrix.runtime.target }})'

bindings/csharp/README.md

@@ -0,0 +1,32 @@
+# Regorus CSharp
+
+**Regorus** is
+
+  - *Rego*-*Rus(t)*  - A fast, light-weight [Rego](https://www.openpolicyagent.org/docs/latest/policy-language/)
+   interpreter written in Rust.
+  - *Rigorous* - A rigorous enforcer of well-defined Rego semantics.
+
+See main [Regorus page](https://github.com/microsoft/regorus) for more details about the project.
+
+# Building
+
+## Github Actions
+
+The simplest way to build a Nuget for Regorus' C# bindings is to use Github Actions. The action to do so is named `bindings/csharp` and is defined in `.github/workflows/test-csharp.yml`.
+
+There are two ways to trigger a Nuget build.
+1. Runs are triggered automatically whenever a push or pull request is made to the `main` branch.
+2. A run can be triggered manually by navigating to the action in the Github UI and clicking `Run workflow`. This option allows you to generate a Nuget for any branch, which is useful when testing the integration of in-progress changes to Regorus with other projects. Nuget files that are generated via this flow will have a `manualtrigger` suffix appended to their version number, making it easy to distinguish them from Nugets generated using the `main` branch.
+![Image displaying the run workflow button](docs/images/readme/manuallytriggeringrun.png)
+
+Once the workflow run completes, the generated Nuget can be downloaded by following these steps:
+1. Open the run.
+2. Click on `Build Regorus nuget` on the left.
+3. Expand the `Upload Regorus nuget` step.
+4. Click the `Artifact download URL` link at the bottom.
+5. Save and extract the downloaded zip file to find the `.nupkg` file.
+![Image displaying the download URL link](docs/images/readme/downloadnuget.png)
+
+## Local
+
+TODO

bindings/csharp/Regorus.Tests/Regorus.Tests.csproj

@@ -7,6 +7,11 @@
     <TestingPlatformDotnetTestSupport>true</TestingPlatformDotnetTestSupport>
     <TestingPlatformShowTestsFailure>true</TestingPlatformShowTestsFailure>
   </PropertyGroup>
+  
+  <PropertyGroup>
+    <!-- If the environment variable is set (such as in a Github Action run), append the suffix to the version number -->
+    <RegorusPackageVersionSuffix Condition="'$(VersionSuffix)' != ''">-$(VersionSuffix)</RegorusPackageVersionSuffix>
+  </PropertyGroup>
 
   <ItemGroup>
     <None Include="../../../tests/**/*.*" Link="tests/%(RecursiveDir)%(Filename)%(Extension)" CopyToOutputDirectory="PreserveNewest" />
@@ -17,6 +22,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Regorus" Version="0.5.0"/>
+    <PackageReference Include="Regorus" Version="0.6.0$(RegorusPackageVersionSuffix)"/>
   </ItemGroup>
 </Project>