document new defaults in images_build.py

Signed-off-by: Federico Rizzo <[email protected]>

Author: fulminemizzega

podman/domain/images_build.py

@@ -63,9 +63,10 @@ def build(self, **kwargs) -> tuple[Image, Iterator[bytes]]:
             isolation (str) – Isolation technology used during build. (ignored)
             use_config_proxy (bool) – (ignored)
             http_proxy (bool) - Inject http proxy environment variables into container (Podman only)
-            layers (bool) - Cache intermediate layers during build.
+            layers (bool) - Cache intermediate layers during build. Default True.
             output (str) - specifies if any custom build output is selected for following build.
             outputformat (str) - The format of the output image's manifest and configuration data.
+                Default to "application/vnd.oci.image.manifest.v1+json" (OCI format).
 
         Returns:
             first item is the podman.domain.images.Image built