feat: slack default color from template

[mkl262]

Set slack default color as template, fix slack docs.

Summary by CodeRabbit

• Improvements
  • Slack notification color assignment now uses template-based logic, providing "danger" for firing alerts and "good" for resolved alerts
  • Enhanced Slack configuration with additional fields for customizing notification appearance and content

[TheMeier]

can you please rebase that?

[mkl262]

@TheMeier Done.

[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: 6bc4fd36-ddb2-49a5-a1d8-8e694447c7be

📥 Commits

Reviewing files that changed from the base of the PR and between 35cbf8d and de182d0.

📒 Files selected for processing (3)

• config/notifiers.go
• docs/configuration.md
• template/default.tmpl

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📝 Walkthrough

Walkthrough

The Slack notifier color template logic is refactored from an inline conditional in the configuration into a separate template definition, while documentation is updated to reflect the change and document related fields.

Changes

Cohort / File(s)	Summary
Configuration Update config/notifiers.go	Default Slack color template changed from inline conditional ({{ if eq .Status "firing" }}danger{{ else }}good{{ end }}) to template reference ({{ template "slack.default.color" . }})
Template Definition template/default.tmpl	New slack.default.color template added, implementing the conditional logic to return "danger" for firing status, otherwise "good"
Documentation docs/configuration.md	Updated Slack configuration defaults to reflect color field template change and documented icon_emoji, icon_url, message_text, and username fields with their default template values

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A template was born from a config so fine,
Where colors were sorted by status divine—
"Danger" when firing, "good" when it's calm,
Now reusable, clean, like a soothing balm! 🎨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is extremely brief and lacks required details such as linked issues, test information, documentation updates, and sign-offs as specified in the template.	Add linked issue reference (Fixes #), clarify if tests were added, confirm documentation updates, and mention sign-off status following the PR checklist template.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: moving Slack default color from a conditional expression to a template-based approach.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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📝 Coding Plan

• Generate coding plan for human review comments

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[mkl262]

@TheMeier Hi, Is there a reason why the checks are still pending?

[TheMeier]

@mkl262 it says right there:

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