simplify the python package build requirements

the example package does not have any other dependencies

hello-world-pypi-package/build-requirements.txt

@@ -0,0 +1,2 @@
+build==1.6.0
+twine==7.0.0

hello-world-pypi-package/requirements.txt

@@ -1,34 +0,0 @@
-backports.tarfile==1.2.0
-build==1.3.0
-certifi==2026.1.4
-cffi==2.0.0
-charset-normalizer==3.4.4
-cryptography==46.0.3
-docutils==0.22.4
-id==1.5.0
-idna==3.11
-importlib_metadata==8.7.1
-jaraco.classes==3.4.0
-jaraco.context==6.0.2
-jaraco.functools==4.4.0
-jeepney==0.9.0
-keyring==25.7.0
-markdown-it-py==4.0.0
-mdurl==0.1.2
-more-itertools==10.8.0
-nh3==0.3.2
-packaging==25.0
-pycparser==2.23
-Pygments==2.19.2
-pyproject_hooks==1.2.0
-readme_renderer==44.0
-requests==2.32.5
-requests-toolbelt==1.0.0
-rfc3986==2.0.0
-rich==14.2.0
-SecretStorage==3.5.0
-tomli==2.3.0
-twine==6.2.0
-typing_extensions==4.15.0
-urllib3==2.6.3
-zipp==3.23.0

provision/use-pypi-repository.sh

@@ -14,18 +14,17 @@ rm -rf .venv
 python3 -m venv .venv
 set +x && source .venv/bin/activate && set -x
 
-# create the hello_world package.
+# install the package build requirements.
+# see https://pypi.org/project/build/
+# see https://pypi.org/project/twine/
+python3 -m pip install -r build-requirements.txt
+
+# build the hello_world package.
 # see https://packaging.python.org/en/latest/tutorials/packaging-projects/
 # see https://help.sonatype.com/en/pypi-repositories.html
-# NB requirements.txt was created as:
-#       python3 -m pip install build twine
-#       python3 -m pip freeze >requirements.txt
-python3 -m pip install -r requirements.txt
 python3 -m build --wheel
-python3 -m pip freeze >.venv/requirements.txt
-diff -u requirements.txt .venv/requirements.txt || (echo ERROR: requirement.txt is not up-to-date && false)
 
-# upload.
+# publish the package.
 export CURL_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt
 cat >.venv/twine.conf <<EOF
 [pypi]