ci: update Slack notification workflow to use environment variables

[anunay-xin]

Slack notification workflow to use environment variables for PR details

Proposed changes

Types of changes

What types of changes does your code introduce to XDC network?
Put an ✅ in the boxes that apply

• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Changes that don't change source code or tests
• docs: Documentation only changes
• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that neither fixes a bug nor adds a feature
• revert: Revert something
• style: Changes that do not affect the meaning of the code
• test: Adding missing tests or correcting existing tests

Impacted Components

Which parts of the codebase does this PR touch?
Put an ✅ in the boxes that apply

• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Tested on a private network from the genesis block and monitored the chain operating correctly for multiple epochs.
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

Summary by CodeRabbit

• Chores
  • Improved Slack notification workflow configuration for better code organization and maintainability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6fd3f09e-a7a4-49ae-a858-1c04970a3fe2

📥 Commits

Reviewing files that changed from the base of the PR and between 6fb59c9 and 839be8f.

📒 Files selected for processing (1)

• .github/workflows/pr-notify-slack.yml

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📝 Walkthrough

Walkthrough

This pull request refactors the Slack notification workflow step by moving environment variable assignments (PR_URL, PR_TITLE, PR_AUTHOR) from inline shell script to the step's env section, utilizing GitHub Actions context expressions (github.event.pull_request.*) for cleaner configuration.

Changes

Cohort / File(s)	Summary
Workflow Environment Configuration .github/workflows/pr-notify-slack.yml	Migrated PR_URL, PR_TITLE, and PR_AUTHOR variable definitions from shell script assignments to step-level env declarations using GitHub Actions context expressions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• ci: add GitHub Actions workflow to notify Slack on PR readiness #2225 — Directly modifies the same workflow file with related changes to how PR metadata variables are handled.

Suggested reviewers

• liam-lai
• wanwiset25
• gzliudan

Poem

🐰 Hops of joy for cleaner configs, hooray!
Variables moved to env in a neater way,
No shell script clutter, just GitHub context dance,
Slack notifications sparkle—what a glance! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: updating the Slack notification workflow to use environment variables for PR details.
Description check	✅ Passed	The description includes the required template structure with the 'Proposed changes' section and properly marked the CI checkbox, though it lacks specific implementation details beyond the template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-slack-ci-error

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