Add spin-trigger-sqs sample app to tests?

[vdice]

Do we want to add an example app using the spin SQS trigger to our suite for testing?

We'd need to come up with a strategy for an SQS mock.

Also, if tested at the Spin Operator level, we'd need to configure the SpinAppExecutor with InstallDefaultCACerts: true and then also make sure SQS-relevant env vars make it to the trigger (eg AWS_DEFAULT_REGION, AWS_* creds). Well, at least for interacting with a real SQS instance... not sure if this changes for a mock.