AWS Code Pipeline fails after adding RDS to Elastic Beanstalk - amazon-web-services

Question

I have an EBS/Tomcat/Java environment created using the CodeStar template in Jan 2020. Recently I added a RDS within the EBS console following these instructions for creating a dev DB within EBS.
Since adding the RDS, my CodePipeline fails in the CloudFormation step, with the error
Failed Environment update activity. Reason: Configuration validation exception: Missing value for required parameter: AWSEBDBPassword
on my EBS dashboard under recent events.
It seems to be missing a database password or permissions, but I'm not sure how to set that.
If it helps, here's my CodeStar pipeline template file:
AWSTemplateFormatVersion: 2010-09-09
Transform:
- AWS::CodeStar
Conditions:
UseSubnet:
Fn::Not:
- Fn::Equals:
- Ref: SubnetId
- subnet-none
Parameters:
ProjectId:
Type: String
Description: AWS CodeStar project ID used to name project resources and create
roles.
InstanceType:
Type: String
Description: The type of Amazon EC2 Linux instances that will be launched for
this project.
KeyPairName:
Type: String
Description: The name of an existing Amazon EC2 key pair in the region where the
project is created, which you can use to SSH into the new Amazon EC2 Linux instances.
VpcId:
Type: String
Description: The ID of the Amazon Virtual Private Cloud (VPC) used for the new
Amazon EC2 Linux instances.
SubnetId:
Type: String
Description: The name of the VPC subnet used for the new Amazon EC2 Linux instances
launched for this project.
SolutionStackName:
Type: String
Description: The software stack used to launch environments and configure instances
in AWS Elastic Beanstalk.
EBTrustRole:
Type: String
Description: The service role in IAM for AWS Elastic Beanstalk to be created for
this project.
EBInstanceProfile:
Type: String
Description: The IAM role that will be created for the Amazon EC2 Linux instances.
Stage:
Type: String
Description: The name for a project pipeline stage, such as Staging or Prod, for
which resources are provisioned and deployed.
Default: ''
Resources:
EBApplication:
Description: The AWS Elastic Beanstalk application, which is a container used
to deploy the correct application configuration.
Type: AWS::ElasticBeanstalk::Application
Properties:
ApplicationName:
Fn::Sub: ${ProjectId}app${Stage}
Description: The name of the AWS Elastic Beanstalk application to be created
for this project.
EBApplicationVersion:
Description: The version of the AWS Elastic Beanstalk application to be created
for this project.
Type: AWS::ElasticBeanstalk::ApplicationVersion
Properties:
ApplicationName:
Ref: EBApplication
Description: The application version number.
SourceBundle:
S3Bucket: aws-codestar-us-west-2-215674088663-aa5050solnprj3-pipe
S3Key: 810d567534b4cb9ca0ee597128a22b94
EBConfigurationTemplate:
Description: The AWS Elastic Beanstalk configuration template to be created for
this project, which defines configuration settings used to deploy different
versions of an application.
Type: AWS::ElasticBeanstalk::ConfigurationTemplate
Properties:
ApplicationName:
Ref: EBApplication
Description: The name of the sample configuration template.
OptionSettings:
- Namespace: aws:elasticbeanstalk:environment
OptionName: EnvironmentType
Value: SingleInstance
- Namespace: aws:elasticbeanstalk:environment
OptionName: ServiceRole
Value:
Ref: EBTrustRole
- Namespace: aws:elasticbeanstalk:healthreporting:system
OptionName: SystemType
Value: enhanced
SolutionStackName:
Ref: SolutionStackName
EBEnvironment:
Description: The AWS Elastic Beanstalk deployment group where the application
is deployed, which is made up of the Amazon EC2 Linux instances launched for
this project.
Type: AWS::ElasticBeanstalk::Environment
Properties:
ApplicationName:
Ref: EBApplication
EnvironmentName:
Ref: EBApplication
Description: The application to be deployed to the environment.
TemplateName:
Ref: EBConfigurationTemplate
VersionLabel:
Ref: EBApplicationVersion
OptionSettings:
- Namespace: aws:autoscaling:launchconfiguration
OptionName: IamInstanceProfile
Value:
Ref: EBInstanceProfile
- Namespace: aws:autoscaling:launchconfiguration
OptionName: InstanceType
Value:
Ref: InstanceType
- Namespace: aws:autoscaling:launchconfiguration
OptionName: EC2KeyName
Value:
Ref: KeyPairName
- Namespace: aws:ec2:vpc
OptionName: VPCId
Value:
Ref: VpcId
- Fn::If:
- UseSubnet
- Namespace: aws:ec2:vpc
OptionName: Subnets
Value:
Ref: SubnetId
- Ref: AWS::NoValue```