tests: move input inside compute

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tests/compute/input/default/main.cue

@@ -0,0 +1,27 @@
+package testing
+
+X1=in: string | *"default input"
+
+test: {
+	string
+
+	#compute: [
+		{
+			do:  "fetch-container"
+			ref: "alpine"
+		},
+		{
+			do: "exec"
+			args: ["sh", "-c", """
+				echo -n "received: \(X1)" > /out
+				"""]
+			// XXX Blocked by https://github.com/blocklayerhq/dagger/issues/19
+			dir: "/"
+		},
+		{
+			do:     "export"
+			source: "/out"
+			format: "string"
+		},
+	]
+}