[codex] Clarify manual PyPI publish target selection

[FlorianPfaff]

Summary

• Shows the selected publish target in the GitHub Actions run name.
• Keeps manual workflow_dispatch publishing selectable between testpypi and pypi, with testpypi as the default.
• Validates the resolved target before emitting the target index and GitHub environment outputs.

Behavior

Manual runs use the selected target_index. Automatic workflow_run releases continue to publish to real PyPI.

Validation

• Reviewed the generated commit diff for .github/workflows/publish-to-pypi.yml.
• Did not run the workflow locally; this change is GitHub Actions configuration only.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	13.35s
✅ JSON	prettier	2	0	0	0	0.42s
✅ JSON	v8r	2		0	0	2.67s
✅ MARKDOWN	markdownlint	2	0	0	0	0.7s
✅ MARKDOWN	markdown-table-formatter	2	0	0	0	0.27s
✅ PYTHON	bandit	366		0	0	5.51s
✅ PYTHON	black	366	12	0	0	8.62s
✅ PYTHON	flake8	366		0	0	3.04s
✅ PYTHON	isort	366	13	0	0	0.71s
✅ PYTHON	mypy	366		0	0	4.99s
✅ PYTHON	pylint	366		0	0	108.0s
✅ PYTHON	ruff	366	13	0	0	0.07s
✅ REPOSITORY	checkov	yes		no	no	22.88s
✅ REPOSITORY	gitleaks	yes		no	no	6.73s
✅ REPOSITORY	git_diff	yes		no	no	0.05s
✅ REPOSITORY	secretlint	yes		no	no	6.82s
✅ REPOSITORY	syft	yes		no	no	6.2s
✅ REPOSITORY	trivy-sbom	yes		no	no	2.42s
✅ REPOSITORY	trufflehog	yes		no	no	19.22s
✅ YAML	prettier	4	0	0	0	0.5s
✅ YAML	v8r	4		0	0	4.72s
✅ YAML	yamllint	4		0	0	0.37s

See detailed reports in MegaLinter artifacts

Your project could benefit from a custom flavor, which would allow you to run only the linters you need, and thus improve runtime performances. (Skip this info by defining FLAVOR_SUGGESTIONS: false)

• Documentation: Custom Flavors
• Command: npx mega-linter-runner@9.4.0 --custom-flavor-setup --custom-flavor-linters PYTHON_PYLINT,PYTHON_BLACK,PYTHON_FLAKE8,PYTHON_ISORT,PYTHON_BANDIT,PYTHON_MYPY,PYTHON_RUFF,COPYPASTE_JSCPD,JSON_V8R,JSON_PRETTIER,MARKDOWN_MARKDOWNLINT,MARKDOWN_MARKDOWN_TABLE_FORMATTER,REPOSITORY_CHECKOV,REPOSITORY_GIT_DIFF,REPOSITORY_GITLEAKS,REPOSITORY_SECRETLINT,REPOSITORY_SYFT,REPOSITORY_TRIVY_SBOM,REPOSITORY_TRUFFLEHOG,YAML_PRETTIER,YAML_YAMLLINT,YAML_V8R

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