[PHOENIX-7323] fix twine check error and add a steps to Releasing guide

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: python-phoenixdb-1.2.2
• Component/s: python, queryserver
• Assignee: Richárd Antal
• Reporter: Richárd Antal
• Created: 03/Jun/24 09:33
• Updated: 04/Jun/24 12:03
• Resolved: 04/Jun/24 07:29

Description

twine check fails with 

ERROR    `long_description` has syntax errors in markup and would not be rendered on PyPI.
         line 36: Error: Unexpected indentation.

Also add steps to RELEASING.rst to upload package to test-PYPI to check these while preparing the RC
https://kynan.github.io/blog/2020/05/23/how-to-upload-your-package-to-the-python-package-index-pypi-test-server 

Issue Links

• relates to: PHOENIX-7324 Run twine from tox for phoenixdb
• links to: GitHub Pull Request #153