Adds CI workflow

Sets up a CI workflow to automatically build and package the project on pushes and pull requests to the main branch.

The workflow includes steps for checking out code, setting up .NET, restoring dependencies, building, publishing, zipping the output, and uploading the artifact.

Author: nullforce

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+
+name: Build and Package
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '9.0.x'
+
+      - name: Restore dependencies
+        run: dotnet restore src/TerminalBackgroundRotator.csproj
+
+      - name: Build
+        run: dotnet build src/TerminalBackgroundRotator.csproj --configuration Release --no-restore
+
+      - name: Publish
+        run: dotnet publish src/TerminalBackgroundRotator.csproj --configuration Release --output publish --no-restore
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: TerminalBackgroundRotator
+          path: publish