feat: support .NET

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

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

@@ -0,0 +1,31 @@
+package dotnet
+
+import (
+	"dagger.io/dagger"
+)
+
+// Publish a dotnet binary
+#Publish: {
+	// Source code
+	source: dagger.#FS
+
+	// Target package to publish
+	package: *"." | string
+
+	env: [string]: string
+
+	container: #Container & {
+		"source": source
+		command: {
+			args: [package]
+			flags: {
+				publish: true
+				"-o":    "/output/"
+			}
+		}
+		export: directories: "/output": _
+	}
+
+	// Directory containing the output of the publish
+	output: container.export.directories."/output"
+}