r/aws_backup_logically_air_gapped_vault: add encryption_key_arn attr

[jackroberts-gh]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

None

Description

• Add encryption_key_arn to aws_backup_logically_air_gapped_vault resource.

New functionality now supports using a CMK to encrypt a LAG Vault:

https://aws.amazon.com/about-aws/whats-new/2025/11/aws-backup-kms-customer-managed-keys/

Relations

Closes #45010

References

• https://aws.amazon.com/about-aws/whats-new/2025/11/aws-backup-kms-customer-managed-keys/
• https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/backup#CreateLogicallyAirGappedBackupVaultInput

Output from Acceptance Testing

%  make testacc TESTS=TestAccBackupLogicallyAirGappedVault PKG=backup
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
make: Running acceptance tests on branch: 🌿 f-aws-backup-lag-vault-kms-key-support 🌿...
TF_ACC=1 go1.24.10 test ./internal/service/backup/... -v -count 1 -parallel 20 -run='TestAccBackupLogicallyAirGappedVault'  -timeout 360m -vet=off
2025/11/11 14:29:51 Creating Terraform AWS Provider (SDKv2-style)...
2025/11/11 14:29:51 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccBackupLogicallyAirGappedVault_basic
=== PAUSE TestAccBackupLogicallyAirGappedVault_basic
=== RUN   TestAccBackupLogicallyAirGappedVault_disappears
=== PAUSE TestAccBackupLogicallyAirGappedVault_disappears
=== RUN   TestAccBackupLogicallyAirGappedVault_encryptionKeyArn
=== PAUSE TestAccBackupLogicallyAirGappedVault_encryptionKeyArn
=== RUN   TestAccBackupLogicallyAirGappedVault_tags
=== PAUSE TestAccBackupLogicallyAirGappedVault_tags
=== CONT  TestAccBackupLogicallyAirGappedVault_basic
=== CONT  TestAccBackupLogicallyAirGappedVault_encryptionKeyArn
=== CONT  TestAccBackupLogicallyAirGappedVault_disappears
=== CONT  TestAccBackupLogicallyAirGappedVault_tags
--- PASS: TestAccBackupLogicallyAirGappedVault_encryptionKeyArn (21.68s)
--- PASS: TestAccBackupLogicallyAirGappedVault_disappears (150.84s)
--- PASS: TestAccBackupLogicallyAirGappedVault_basic (154.13s)
--- PASS: TestAccBackupLogicallyAirGappedVault_tags (448.04s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/backup     452.980s

...

[github-actions]

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