Remove path based task lookup

Signed-off-by: Helder Correia <174525+helderco@users.noreply.github.com>

pkg/dagger.io/dagger/plan.cue

@@ -24,7 +24,7 @@ package dagger
 		}
 
 		// Access client environment variables
-		env: [string]: *string | #Secret
+		env: _#clientEnv
 
 		// Execute commands in the client
 		commands: [id=string]: _#clientCommand
@@ -93,6 +93,13 @@ _#clientFilesystemWrite: {
 	}
 }
 
+_#clientEnv: {
+	$dagger: task: _name: "ClientEnv"
+
+	// CUE type defines expected content
+	[!~"\\$dagger"]: *string | #Secret
+}
+
 _#clientCommand: {
 	$dagger: task: _name: "ClientCommand"