Switch to conda-build with libmamba solver

conda_smithy/configure_feedstock.py

@@ -1856,17 +1856,15 @@ def _load_forge_config(forge_dir, exclusive_config_file, forge_yml=None):
         "conda_forge_output_validation": False,
         "private_upload": False,
         "secrets": [],
-        "conda_build_tool": "mambabuild",
-        "conda_build_tool_deps": "boa",
+        "conda_build_tool": "conda-build",
         "conda_install_tool": "mamba",
-        "conda_install_tool_deps": "mamba",
-        "conda_solver": None,
+        "conda_solver": "libmamba",
         # feedstock checkout git clone depth, None means keep default, 0 means no limit
         "clone_depth": None,
         # Specific channel for package can be given with
         #     ${url or channel_alias}::package_name
         # defaults to conda-forge channel_alias
-        "remote_ci_setup": ["conda-forge-ci-setup=3"],
+        "remote_ci_setup": ["conda-forge-ci-setup=4"],
     }
 
     if forge_yml is None:

news/libmamba.rst

@@ -0,0 +1,24 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* The default build tool changed from conda-mambabuild to conda-build with
+  libmamba solver.
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>

tests/test_configure_feedstock.py

@@ -878,7 +878,9 @@ def test_conda_build_tools(config_yaml):
     assert (
         "build_with_mambabuild" not in cfg
     )  # superseded by conda_build_tool=mambabuild
-    assert cfg["conda_build_tool"] == "mambabuild"  # current default
+    assert (
+        cfg["conda_build_tool"] == "conda-build"
+    )  # current default
 
     # legacy compatibility config
     with open(os.path.join(config_yaml, "conda-forge.yml")) as fp: