build args --force-rm --rm can be disabled/replaced

repo2podman/podman.py

@@ -8,7 +8,7 @@
 import tarfile
 from tempfile import TemporaryDirectory
 from threading import Thread
-from traitlets import Unicode
+from traitlets import List, Unicode
 
 from docker_image.reference import Reference
 
@@ -339,7 +339,16 @@ class PodmanEngine(ContainerEngine):
         For example, you could use an alternative podman/docker compatible command.
         Defaults to `podman` on the PATH.
         """,
-    ).tag(config=True)
+        config=True,
+    )
+
+    podman_build_args = List(
+        ["--force-rm", "--rm"],
+        help="""Additional arguments passed to podman build in addition to those
+        set by repo2docker
+        """,
+        config=True,
+    )
 
     def __init__(self, *, parent):
         super().__init__(parent=parent)
@@ -394,10 +403,6 @@ def build(
         except KeyError:
             pass
 
-        cmdargs.append("--force-rm")
-
-        cmdargs.append("--rm")
-
         if tag:
             cmdargs.extend(["--tag", tag])
 
@@ -421,6 +426,8 @@ def build(
         if kwargs:
             raise ValueError("Additional kwargs not supported")
 
+        cmdargs.extend(self.podman_build_args)
+
         # Avoid try-except so that if build errors occur they don't result in a
         # confusing message about an exception whilst handling an exception
         if fileobj: