fix: use eu01 region for AWS provider to fix compatibility with hashicorp/aws v6

[nroi]

AWS provider v6 introduced enhanced region support which changed CreateBucket
to always include LocationConstraint, even for us-east-1. STACKIT Object
Storage (StorageGRID) rejects us-east-1 as an invalid location constraint.

Set region to eu01 (the STACKIT Object Storage region) so the LocationConstraint
sent matches what StorageGRID is configured to accept. Add skip_region_validation
as eu01 is not a standard AWS region name.

https://github.com/stackitcloud/terraform-provider-stackit/blob/main/docs/guides/aws_provider_s3_stackit.md

BD-2505

[github-actions]

Scorecard Check

Scorecard run on commit 4c0723aeeae38285932125ed634cd062080eb663 relative to origin/main

📊 meshstack-hub Module Scorecard

Generated: 2026-06-10 | Modules scanned: 1 | Categories: 5

📋 Per-Module Category Summary

Score per category per building block. n/a = category does not apply to this module.

Module	Overall	Core Structure	Integration	Azure Backplane	STACKIT Backplane	Testing
stackit/storage-bucket	🟢 100%	🟢 100%	🟢 100%	n/a	🟢 100%	🟢 100%

✅ All checks passing! This module meets all scorecard criteria.

Core Structure — ✅ all passing

Basic module file structure and documentation — applies to 1 modules

Module	Score	📦	🔗	📋	📝	🖼️	📌	🔒
stackit/storage-bucket	🟢 100%	✅	✅	➖	✅	✅	✅	✅

Core Structure — Summary

Emoji	Criterion	Coverage	Status
📦	buildingblock/ directory exists	1/1	🟢 100%
🔗	meshstack_integration.tf present	1/1	🟢 100%
📋	buildingblock/APP_TEAM_README.md present (no-integration fallback)	n/a	—
📝	buildingblock/README.md with YAML front-matter	1/1	🟢 100%
🖼️	buildingblock/logo.png included	1/1	🟢 100%
📌	buildingblock/versions.tf present	1/1	🟢 100%
🔒	Provider versions use minimum constraint (>=)	1/1	🟢 100%

Integration — ✅ all passing

meshstack_integration.tf conventions — applies to 1 modules

Module	Score	🏷️	🏢	📤	🔌	📎	🔀	📋	🏷️	📖	📝	📊	🚫
stackit/storage-bucket	🟢 100%	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅

Integration — Summary

Emoji	Criterion	Coverage	Status
🏷️	variable "hub" in integration	1/1	🟢 100%
🏢	variable "meshstack" in integration	1/1	🟢 100%
📤	building_block_definition output exposed	1/1	🟢 100%
🔌	meshcloud/meshstack in required_providers	1/1	🟢 100%
📎	backplane source uses var.hub.git_ref	1/1	🟢 100%
🔀	ref_name uses var.hub.git_ref	1/1	🟢 100%
📋	version_spec.draft uses var.hub.bbd_draft	1/1	🟢 100%
🏷️	BBD metadata.tags forwards var.meshstack.tags	1/1	🟢 100%
📖	BBD readme field present	1/1	🟢 100%
📝	BBD readme starts with plain-text description (no heading)	1/1	🟢 100%
📊	BBD readme has shared responsibility table (✅/❌)	1/1	🟢 100%
🚫	No documentation_md output in backplane	1/1	🟢 100%

Azure Backplane — not applicable

Azure UAMI-based automation principal conventions — applies to 0 modules

No applicable modules.

STACKIT Backplane — ✅ all passing

STACKIT WIF-based automation principal conventions — applies to 1 modules

Module	Score	🔐	🚫	📤	⚡
stackit/storage-bucket	🟢 100%	✅	✅	✅	✅

STACKIT Backplane — Summary

Emoji	Criterion	Coverage	Status
🔐	Uses stackit_service_account_federated_identity_provider	1/1	🟢 100%
🚫	No stackit_service_account_key resource	1/1	🟢 100%
📤	Outputs service_account_email (not key)	1/1	🟢 100%
⚡	Buildingblock provider uses use_oidc = true	1/1	🟢 100%

Testing — ✅ all passing

End-to-end test coverage — applies to 1 modules

Module	Score	⚙️	🧪	✅
stackit/storage-bucket	🟢 100%	✅	✅	✅

Testing — Summary

Emoji	Criterion	Coverage	Status
⚙️	backplane/ directory (optional tier)	1/1	🟢 100%
🧪	e2e/ test directory exists	1/1	🟢 100%
✅	e2e/ contains .tftest.hcl files	1/1	🟢 100%

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