docs: clarify S3-compatible endpoint configuration for backups

[goanpeca]

Summary

The backup-s3 module already works with Amazon S3 and any S3-compatible object store (it builds its client from BACKUP_S3_ENDPOINT), but the backups page does not spell out how to point it at a non-AWS endpoint or how its AWS-named credentials apply to compatible backends. This adds that guidance. Docs only, no code or behavior changes.

What changed

One file, docs/deploy/configuration/backups.md:

• Broadened the S3 intro line to lead with Amazon S3 and name a few S3-compatible examples (Backblaze B2, Cloudflare R2, MinIO).
• Updated the S3 configuration table to clarify that BACKUP_S3_ENDPOINT accepts a host with an optional port, must not include an http:// or https:// scheme, and uses BACKUP_S3_USE_SSL for TLS.
• Reworked the S3 authentication text so AWS IAM/ARN stays AWS-specific while access-key credentials are documented as usable with S3-compatible backends.
• Added a short "S3-compatible endpoints" subsection with a copy-pasteable env example using a placeholder endpoint, optional port guidance, and optional AWS_REGION guidance.

Notes

Examples use a placeholder endpoint and no provider is singled out.

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[Copilot]

Pull request overview

This PR updates the backups configuration documentation to more explicitly explain how to use the backup-s3 module with non-AWS, S3-compatible object stores by clarifying BACKUP_S3_ENDPOINT usage and related environment variables.

Changes:

• Expanded the S3 section intro to explicitly mention Amazon S3 plus several S3-compatible providers.
• Added an “S3-compatible endpoints” subsection with guidance and a copy/paste environment example.

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[goanpeca]

I agree with the CLA

[Copilot]

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