feat: support .NET

Signed-off-by: Olli Janatuinen <olli.janatuinen@gmail.com>

pkg/universe.dagger.io/x/olli.janatuinen@gmail.com/dotnet/container.cue

@@ -0,0 +1,31 @@
+// .NET operation
+package dotnet
+
+import (
+	"dagger.io/dagger"
+	"universe.dagger.io/docker"
+)
+
+// A standalone dotnet environment to run dotnet command
+#Container: {
+	// Container app name
+	name: *"dotnet_publisher" | string
+
+	// Source code
+	source: dagger.#FS
+
+	// Use dotnet image
+	_image: #Image
+
+	_sourcePath: "/src"
+
+	docker.#Run & {
+		input:   *_image.output | docker.#Image
+		workdir: "/src"
+		command: name: "dotnet"
+		mounts: "source": {
+			dest:     _sourcePath
+			contents: source
+		}
+	}
+}