💚 Fix version string to be PEP440 compliant for TestPyPI

Change from semver to PEP440 and remove the git hash part of the version string when uploading to TestPyPI. Based on mtkennerly/poetry-dynamic-versioning#78 (comment). Prevents errors like `'0.0.0.post15+f899e49' is an invalid value for Version. Error: Can't use PEP 440 local versions. See https://packaging.python.org/specifications/core-metadata for more information`.

.github/workflows/publish-to-pypi.yml

@@ -43,6 +43,14 @@ jobs:
           poetry plugin add poetry-dynamic-versioning-plugin
           poetry show
 
+      - name: Fix up version string for TestPyPI
+        if: ${{ !startsWith(github.ref, 'refs/tags') }}
+        run: |
+          # Change poetry-dynamic-versioning to use metadata=false so that the
+          # local part of the version isn't included, making the version string
+          # compatible with PyPI.
+          sed --in-place "s/metadata = true/metadata = false/g" pyproject.toml
+
       - name: Build a binary wheel and a source tarball
         run: |
           poetry build -vvv

pyproject.toml

@@ -38,8 +38,10 @@ docs = [
 ]
 
 [tool.poetry-dynamic-versioning]
+bump = true
 enable = true
-style = "semver"
+metadata = true
+style = "pep440"
 
 [build-system]
 requires = ["poetry>=1.2.0b1", "poetry-dynamic-versioning"]