Allow the dynamodb table via the policy

[rgarrigue]

Hi

I've a multi account setup, using Terragrunt, with states centralized in a shared admin account. Attaching the policy to an assumable role, I expected to be done, but turns out I can't deal with the DyanmoDB table

ERRO[0001] AccessDeniedException: User: arn:aws:sts::11111111111111:assumed-role/company-shared-terraform-state-access/222222222222222222 is not authorized to perform: dynamodb:DescribeTable on resource: arn:aws:dynamodb:eu-north-1:333333333333333:table/company-shared-terraform-locks because no identity-based policy allows the dynamodb:DescribeTable action

I'll add this myself, but imho this should be added here