* add support for --input-file in dagger compute

* secrets now supports bytes
* error reporting for unhandled content data types in WriteFile

Signed-off-by: Frederick F. Kautz IV <fkautz@alumni.cmu.edu>

stdlib/dagger/dagger.cue

@@ -15,4 +15,6 @@ import (
 // Secret value
 // FIXME: currently aliased as a string to mark secrets
 // this requires proper support.
-#Secret: string
+#Secret: {
+	string | bytes
+}