Support for Custom Tags in AWS SSM Parameter Store

[wadherv]

Currently, the Lambda function responsible for creating AWS SSM Parameter Store entries in the GitHub AWS Runners Terraform module only supports a hardcoded tag:

await putParameter(${githubRunnerConfig.ssmTokenPath}/${instance}, runnerConfig.data.encoded_jit_config, true, {  
   tags: [{ Key: 'InstanceId', Value: instance }],
})

Ref:

1. https://github.com/github-aws-runners/terraform-aws-github-runner/blob/main/lambdas/functions/control-plane/src/scale-runners/scale-up.ts#L182
2. https://github.com/github-aws-runners/terraform-aws-github-runner/blob/main/lambdas/functions/control-plane/src/scale-runners/scale-up.ts#L409
3. https://github.com/github-aws-runners/terraform-aws-github-runner/blob/main/lambdas/functions/control-plane/src/scale-runners/scale-up.ts#L467

This implementation does not allow for additional custom tags to be added via environment variables or configuration. Supporting custom tags would be highly beneficial for organizations that need to:

• Track cost allocation across different teams or projects.
• Manage ownership and accountability of resources.
• Integrate with internal tagging policies for governance and automation.

[wadherv]

PR Raised: #4834