Merge pull request #1790 from shykes/nop

dagger.#Nop: work around bugs in the DAG resolver

pkg/dagger.io/dagger/nop.cue

@@ -0,0 +1,10 @@
+package dagger
+
+// A core action that does nothing
+// Useful to work around bugs in the DAG resolver.
+//  See for example https://github.com/dagger/dagger/issues/1789
+#Nop: {
+	$dagger: task: _name: "Nop"
+	input:  _
+	output: input
+}