ci: Use environment for twine/slack

[ko3n1g]

What does this PR do ?

Add a one line overview of what this PR aims to accomplish.

Changelog

• Add specific line by line info of high level changes in this PR.

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Additional Information

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Summary by CodeRabbit

• Chores
  • Updated internal release workflow configuration for improved secret handling.

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No user-facing changes in this release.

[coderabbitai]

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Review failed

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ℹ️ Recent review info

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 163febc and c61a796.

📒 Files selected for processing (1)

• .github/workflows/release.yaml

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📝 Walkthrough

Walkthrough

Simplified GitHub Actions release workflow secrets handling by replacing conditional branch-based secret lookups with direct secret references for TWINE_PASSWORD and SLACK_WEBHOOK, reducing configuration complexity while maintaining the same control flow.

Changes

Cohort / File(s)	Summary
Release Workflow Configuration .github/workflows/release.yaml	Replaced conditional secret lookups with direct secret references: secrets.TWINE_PASSWORD (previously branch-conditional) and secrets.SLACK_RELEASE_ENDPOINT (previously branch-conditional).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• ci: Remove environments #2423: Also modifies TWINE_PASSWORD sourcing in .github/workflows/release.yaml with direct secret reference approach.
• ci(fix): TestPyPI #2516: Simplifies conditional TWINE_PASSWORD resolution in GitHub Actions workflow by replacing branch-based selection with fixed secret references.

Suggested reviewers

• thomasdhc
• chtruong814

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ko3n1g/ci/use-environment-again

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