Unit tests to reproduce issue #19 and narrow down root cause.

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

examples/tests/repro-19/main.cue

@@ -0,0 +1,15 @@
+package test
+
+#dagger: compute: [
+	{
+		do:  "fetch-container"
+		ref: "busybox"
+	},
+	{
+		do: "exec"
+		args: ["sh", "-c", """
+			    echo hello > /tmp/out
+			"""]
+		//                dir: "/"
+	},
+]