Configure PDM to avoid +local version suffix on clean builds.

pdm_build.py

@@ -0,0 +1,12 @@
+import os
+from datetime import datetime
+from pdm.backend.hooks.version import SCMVersion
+
+
+def format_version(version: SCMVersion) -> str:
+    major, minor = (int(n) for n in str(version.version).split(".")[:2])
+    dirty = f"+{datetime.utcnow():%Y%m%d.%H%M%S}" if version.dirty else ""
+    if version.distance is None:
+        return f"{major}.{minor}{dirty}"
+    else:
+        return f"{major}.{minor}.dev{version.distance}{dirty}"

pyproject.toml

@@ -1,5 +1,6 @@
 [tool.pdm.version]
 source = "scm"
+version_format = "pdm_build:format_version"
 
 [project]
 dynamic = ["version"]
@@ -20,7 +21,8 @@ dependencies = [
 ]
 
 [build-system]
-requires = ["pdm-backend"]
+# https://github.com/pdm-project/pdm-backend/pull/217#issuecomment-2032623648
+requires = ["pdm-backend @ git+https://github.com/pdm-project/pdm-backend"]
 build-backend = "pdm.backend"
 
 [tool.pdm.build]