inputs: pre-defined input paths

Instead of bind-mounting each individual input into the container,
create a temporary directory that is used by all inputs and bind-
mount this to the well known location ("/run/osbuild/inputs"). The
temporary directory is then passed to the input so that it can
make the requested resources available relative to that directory.
This is enforced by the common input handling code.
Additionally, pass the well known input path via a new "paths" key
to the arguments dictionary passed to the stage.

inputs/org.osbuild.noop

@@ -8,9 +8,9 @@ it to the stage.
 
 
 import json
+import os
 import sys
-
-from osbuild.objectstore import StoreClient
+import uuid
 
 
 SCHEMA = """
@@ -21,10 +21,12 @@ SCHEMA = """
 def main():
     args = json.load(sys.stdin)
     refs = args["refs"]
+    target = args["target"]
 
-    store = StoreClient(connect_to=args["api"]["store"])
+    uid = str(uuid.uuid4())
+    path = os.path.join(target, uid)
+    os.makedirs(path)
 
-    path = store.mkdtemp(prefix="empty")
     data = {"path": path, "data": {"refs": refs}}
     json.dump(data, sys.stdout)
     return 0