Fix matrix expression in dotnet publish

.gitea/workflows/ci.yml

@@ -5,6 +5,19 @@ on: [push]
 jobs:
   build:
     runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        rid: ["win-x64", "linux-x64"]
+
     steps:
-      - name: Printing hello
-        run: echo "Hello"
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: '8.0.x'
+
+      - run: dotnet restore
+
+      - run: dotnet publish -o app -r ${{ matrix.rid }} --self-contained true /p:PublishSingleFile=true
+

Program.cs

@@ -0,0 +1,2 @@
+// See https://aka.ms/new-console-template for more information
+Console.WriteLine("Hello, World!");

citest.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

main.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main()
+{
+    printf("Halo, Welt!");
+    return 0;
+}
+