tox packaging job fails in CI

E.g. as in https://travis-ci.org/github/matrix-org/python-signedjson/jobs/770347173

$ tox
GLOB sdist-make: /home/travis/build/matrix-org/python-signedjson/setup.py
packaging create: /home/travis/build/matrix-org/python-signedjson/.tox/packaging
packaging installdeps: check-manifest
packaging inst: /home/travis/build/matrix-org/python-signedjson/.tox/.tmp/package/1/signedjson-1.1.2.dev6+gde64b47.zip
packaging installed: canonicaljson==1.1.4,cffi==1.14.0,check-manifest==0.41,frozendict==1.2,importlib-metadata==1.6.0,pep517==0.8.2,pycparser==2.20,PyNaCl==1.3.0,signedjson==1.1.2.dev6+gde64b47,simplejson==3.17.0,six==1.14.0,toml==0.10.0,typing-extensions==3.7.4.2,unpaddedbase64==1.1.0,zipp==3.1.0
packaging run-test-pre: PYTHONHASHSEED='2381353217'
packaging run-test: commands[0] | check-manifest
lists of files in version control and sdist do not match!
missing from sdist:
  CHANGELOG.md
  RELEASING.md
  changelog.d
  pyproject.toml
suggested MANIFEST.in rules:
  include *.md
  include *.toml
ERROR: InvocationError for command /home/travis/build/matrix-org/python-signedjson/.tox/packaging/bin/check-manifest (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   packaging: commands failed
The command "tox" exited with 1.
Done. Your build exited with 1.

Bắt đầu bằng cách chạy tox và kiểm tra setup.py, cấu hình job đóng gói cũng như đầu ra của check-manifest. Xác nhận lý do CHANGELOG.md, RELEASING.md, changelog.d và pyproject.toml không có trong bản phân phối mã nguồn, sau đó kiểm tra rằng job đóng gói chạy thành công với tất cả các tệp bắt buộc được đưa vào.