osbuild.py: give assemblers a full devtmpfs

This follows what is done for the stages. We intend to look into
making this unnecessary, but for now allow full access so we can
work on the individual assemblers.

Signed-off-by: Tom Gundersen <teg@jklm.no>

osbuild.py

@@ -140,7 +140,7 @@ class BuildRoot:
             f"{libdir}/assemblers/{name}:/run/osbuild/{name}"
         ]
         robinds.extend(self._get_system_resources_from_etc(assembler))
-        binds = []
+        binds = ["/dev:/dev"]
 
         if input_dir:
             robinds.append(f"{input_dir}:/run/osbuild/input")