f/aws_db_instance add support for Db2

[AdamTylerLynch]

Description

Adding support for Db2 engine.

Relations

Closes #34688

References

• Docs: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Db2.html
• API: https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_CreateDBInstance.html
• CLI: https://awscli.amazonaws.com/v2/documentation/api/latest/reference/rds/create-db-instance.html
• Getting Started: https://aws.amazon.com/blogs/aws/getting-started-with-new-amazon-rds-for-db2/

Output from Acceptance Testing

% make testacc PKG=rds TESTS=TestAccRDSInstance_Db2_basic ACCTEST_PARALLELISM=1

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 1 -run='TestAccRDSInstance_Db2_basic'  -timeout 360m
=== RUN   TestAccRDSInstance_Db2_basic
=== PAUSE TestAccRDSInstance_Db2_basic
=== CONT  TestAccRDSInstance_Db2_basic
--- PASS: TestAccRDSInstance_Db2_basic (757.44s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	760.700s

% make testacc PKG=rds TESTS=TestAccRDSInstance_basic ACCTEST_PARALLELISM=1    
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 1 -run='TestAccRDSInstance_basic'  -timeout 360m
=== RUN   TestAccRDSInstance_basic
=== PAUSE TestAccRDSInstance_basic
=== CONT  TestAccRDSInstance_basic
--- PASS: TestAccRDSInstance_basic (480.85s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	483.949s

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccRDSInstance_DB2_basic\|TestAccRDSInstance_basic' PKG=rds
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 20  -run=TestAccRDSInstance_DB2_basic\|TestAccRDSInstance_basic -timeout 360m
=== RUN   TestAccRDSInstance_basic
=== PAUSE TestAccRDSInstance_basic
=== RUN   TestAccRDSInstance_DB2_basic
    instance_test.go:640: Environment variables RDS_DB2_CUSTOMER_ID and RDS_DB2_SITE_ID are not set
--- SKIP: TestAccRDSInstance_DB2_basic (0.00s)
=== CONT  TestAccRDSInstance_basic
--- PASS: TestAccRDSInstance_basic (558.12s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	564.184s

[ewbankkit]

@AdamTylerLynch Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v5.31.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.