Add CI enhancements for package building, artifact handling, and automated PyPI publishing

[youtux]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances the CI pipeline by adding a new build job that installs necessary build tools, builds distribution artifacts, and uploads them for use in automated testing and PyPI publishing.

• Updates the releasing process documentation in RELEASING.md to include explicit commit and tagging steps.
• Introduces a new GitHub Actions workflow job for building the package and handling artifacts, and updates the test-run and pypi-publish jobs accordingly.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
RELEASING.md	Updated release instructions to commit changes and push a tag.
.github/workflows/main.yml	Added build job, updated checkout and setup actions, and integrated artifact handling for testing and PyPI publishing.

Comments suppressed due to low confidence (2)

.github/workflows/main.yml:110

• The comment indicates the use of 'dist/.tar.gz' while the actual command installs 'dist/.whl'. Please update the comment to accurately reflect the file being installed.

          # Using `installpkg dist/*.tar.gz` because we want to install the pre-built package (want to test against that)

.github/workflows/main.yml:120

• Changing 'fail_ci_if_error' from true to false means Codecov errors will not fail the CI. Please confirm that this behavior is intentional to avoid potential issues with code quality checks.

        fail_ci_if_error: false

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.76%. Comparing base (9999a2f) to head (0d501fb).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #240   +/-   ##
=======================================
  Coverage   97.76%   97.76%           
=======================================
  Files          14       14           
  Lines         852      852           
  Branches       51       51           
=======================================
  Hits          833      833           
  Misses          8        8           
  Partials       11       11           

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