Added a user error on add from a URL of an unsupported scheme, and fixed crash on attempting to add a non-URL archive file

Signed-off-by: jakub-nt <175944085+jakub-nt@users.noreply.github.com>

Author: jakub-nt

cfbs/cfbs_config.py

@@ -386,16 +386,20 @@ def add_command(
 
         before = {m["name"] for m in self.get("build", [])}
 
-        if to_add[0].endswith(SUPPORTED_ARCHIVES) or to_add[0].startswith(
-            SUPPORTED_URI_SCHEMES
-        ):
+        if to_add[0].startswith(SUPPORTED_URI_SCHEMES):
             self._add_using_url(
                 url=to_add[0],
                 to_add=to_add[1:],
                 added_by=added_by,
                 checksum=checksum,
             )
         else:
+            # for this `if` to be valid, module names containing `://` should be illegal
+            if "://" in to_add[0]:
+                user_error(
+                    "URI scheme not supported. The supported URI schemes are: "
+                    + ", ".join(SUPPORTED_URI_SCHEMES)
+                )
             self._add_modules(to_add, added_by, checksum)
 
         added = {m["name"] for m in self["build"]}.difference(before)