build: only take versions from v[0-9]* tags

setuptools-scm's default describe picks the nearest tag containing a
digit, so a local non-release tag (a date-stamped backup, say) could
become the version and break builds with "Can't parse version from
tag". Restrict describe to release tags. The legacy 0.11.0 tag, with
no "v", is ignored from now on.

Prompt: For some of my python-libraries, the [local backup] tag can break local hatch-vcs builds, because hatch-vcs tries to read it as a version number.  This has been fixed somewhere but not everywhere.  Please check [and] fix it wherever it's relevant

Assisted-By: Claude Opus 5.5
Reviewed-by: Tobias Brox <tobias@redpill-linpro.com>

Author: tobixen

pyproject.toml

@@ -63,6 +63,10 @@ build-backend = "hatchling.build"
 
 [tool.hatch.version]
 source = "vcs"
+# Only v<digit>* tags are releases. The default describe takes the nearest
+# tag containing a digit, so a date-stamped local tag (a pre-rewrite backup,
+# say) could become the version and break the build.
+raw-options = { scm = { git = { describe_command = "git describe --dirty --tags --long --abbrev=40 --match v[0-9]*" } } }
 
 [tool.hatch.build.hooks.vcs]
 version-file = "plann/_version.py"