docs: azure_blob: document OAuth authentication support

[zshuang0316]

Add new auth_type values (managed_identity, service_principal, workload_identity) and their required configuration parameters (tenant_id, client_id, client_secret, workload_identity_token_file). Add OAuth authentication section with examples for each method.

Summary by CodeRabbit

• Documentation
  • Expanded Azure Blob Storage authentication to include managed identity, service principal, and workload identity alongside existing key and SAS methods
  • Added Azure AD credential parameters (client ID, client secret, tenant ID, and workload identity token file path) and noted when each is required
  • Added an OAuth authentication section with example configurations and usage guidance for all supported auth flows

[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: b00fbe41-301a-49de-8e87-5e855953dc38

📥 Commits

Reviewing files that changed from the base of the PR and between e624619 and 05784fb.

📒 Files selected for processing (1)

• pipeline/outputs/azure_blob.md

✅ Files skipped from review due to trivial changes (1)

• pipeline/outputs/azure_blob.md

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📝 Walkthrough

Walkthrough

Documentation expanded for the Azure Blob output plugin to add OAuth-based authentication options (managed_identity, service_principal, workload_identity), with new configuration parameters (client_id, client_secret, tenant_id, workload_identity_token_file) and example Fluent Bit configurations for each auth flow.

Changes

Cohort / File(s)	Summary
Azure Blob Authentication Documentation pipeline/outputs/azure_blob.md	Expanded auth_type values to include managed_identity, service_principal, and workload_identity; added client_id, client_secret, tenant_id, and workload_identity_token_file parameters; introduced an OAuth authentication section with example fluent-bit.yaml and fluent-bit.conf snippets. Existing key (shared_key) and sas (sas_token) docs left unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested labels

5.0

Suggested reviewers

• cosmo0920
• patrick-stephens

Poem

🐰 I hopped through docs with nimble feet,

Added OAuth routes so auth is neat.
Managed, Principal, Workload in sight,
Fluent Bit examples to make it right.
🥕✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: documenting OAuth authentication support for Azure Blob, which aligns with the PR's primary objective of adding documentation for managed_identity, service_principal, and workload_identity authentication methods.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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