Use curl | bash with helpful text for stack-aws-sample keyfile generation in meta, like azure and gcp

[prasek]

Problem

stack-gcp-sample and stack-azure-sample use a curl | bash with helpful text:

• https://github.com/crossplane/stack-aws-sample/blob/master/.registry/resources/awssample.ui-schema.yaml#L36
• https://github.com/crossplane/stack-azure-sample/blob/master/.registry/resources/azuresample.ui-schema.yaml#L54

curl -s https://raw.githubusercontent.com/crossplane/stack-azure-sample/master/hack/azure-credentials.sh | bash -
Creating a role assignment under the scope of "/subscriptions/val"
  Retrying role assignment creation: 1/36
  Retrying role assignment creation: 2/36
Invoking "az ad app permission grant --id val --api 00000002-0000-0000-c000-000000000000" is needed to make the change effective

********************
{
  "clientId": "val",
  "clientSecret": "val",
  "subscriptionId": "val",
  "tenantId": "val",
  "activeDirectoryEndpointUrl": "https://login.microsoftonline.com",
  "resourceManagerEndpointUrl": "https://management.azure.com/",
  "activeDirectoryGraphResourceId": "https://graph.windows.net/",
  "sqlManagementEndpointUrl": "https://management.core.windows.net:8443/",
  "galleryEndpointUrl": "https://gallery.azure.com/",
  "managementEndpointUrl": "https://management.core.windows.net/"
}
********************

Your Azure Sample Stack keyfile is shown above, between the asterisks.

but stack-aws-sample does not, and just inlines the script without helpful text or asterisks:

• https://github.com/crossplane/stack-aws-sample/blob/master/.registry/resources/awssample.ui-schema.yaml#L36

AWS_PROFILE=default && echo -e "[default]\naws_access_key_id = $(aws configure get aws_access_key_id --profile $AWS_PROFILE)\naws_secret_access_key = $(aws configure get aws_secret_access_key --profile $AWS_PROFILE)"
[default]
aws_access_key_id = val
aws_secret_access_key = val

What can Crossplane do to help?

Use a curl | bash for https://github.com/crossplane/stack-aws-sample/blob/master/.registry/resources/awssample.ui-schema.yaml#L36 like the other stacks, with more helpful output, like stack-azure-sample does here:

curl -s https://raw.githubusercontent.com/crossplane/stack-aws-sample/master/hack/aws-credentials.sh | bash -

********************
[default]
aws_access_key_id = val
aws_secret_access_key = val
********************

Your AWS Sample Stack keyfile is shown above, between the asterisks.