Add March 2026 quarterly baselines

[Copilot]

Adds the March 2026 quarterly baseline checkpoint, marking December 2025 baselines as obsolete.

Changes

• Baseline.Rule.yaml — Added Azure.GA_2026_03 and Azure.Preview_2026_03 baselines (moduleVersion: v1.48.0, AZURE_AKS_CLUSTER_MINIMUM_VERSION: 1.33.7, ruleSets through 2026_03); marked Azure.GA_2025_12 and Azure.Preview_2025_12 as obsolete: true
• CAF.Rule.yaml — Added Azure.CAF_2026_03 baseline mirroring the CAF_2025_12 naming configuration, extended with 2026_03 ruleSet
• changelog.md — Added Unreleased entry for the new baselines
• Azure.Baseline.Tests.ps1 — Added unit tests for Azure.GA_2026_03 (517 GA rules) and Azure.Preview_2026_03 (8 preview rules)
• .github/prompts/quarterly-baseline-update.prompt.md — New prompt file with step-by-step agent instructions for future quarterly baseline updates

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[FEATURE] March 2026 quarterly baselines</issue_title>
<issue_description>### Your suggestion

Update baseline for March 2026.

Alternatives

na

Additional context

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [FEATURE] March 2026 quarterly baselines #3709

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[BernieWhite]

@copilot Your existing changes are correct. Two things to improve:

1. you need to update unit tests for baselines so that the expected number of matching rules can be consistently tested.
2. create a new prompt file in ./.github/prompts/ to provide agent instructions so this can be done consistently for future quarterly updates to baselines.

[Copilot]

@copilot Your existing changes are correct. Two things to improve:

1. you need to update unit tests for baselines so that the expected number of matching rules can be consistentl...

Done in commit 53007ce:

1. Added unit tests for Azure.GA_2026_03 (517 GA rules) and Azure.Preview_2026_03 (8 preview rules) to tests/PSRule.Rules.Azure.Tests/Azure.Baseline.Tests.ps1. All 46 baseline tests pass.

2. Created .github/prompts/quarterly-baseline-update.prompt.md with step-by-step instructions covering: determining the new period/version/AKS version, updating Baseline.Rule.yaml (marking previous as obsolete, appending new GA+Preview baselines), updating CAF.Rule.yaml, adding unit tests with the correct rule counts, building/verifying, and updating the changelog.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• www.powershellgallery.com
  • Triggering command: /usr/bin/pwsh pwsh -Command $ErrorActionPreference = 'Stop' Install-Module InvokeBuild -MinimumVersion 5.4.0 -Scope CurrentUser -Force -ErrorAction SilentlyContinue Invoke-Build BuildModule -File pipeline.build.ps1 -Configuration Debug -Build '0.0.1' (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)