Add find_ami_id logic instead of pass argument --instance-id

[gthao313]

Issue number:
#162

Description of changes:

Author: Tianhao Geng <tianhg@amazon.com>
Date:   Thu Mar 10 01:43:23 2022 +0000

    Add find_ami_id logic instead of pass argument `--instance-id`

    currently integration test needs human manually find bottlerocket ami id
    and pass it to integration test via `--instance-id`, which isn't efficient
    and convenient; therefore, we add a new logic about finding ami id
    via aws-sdk-ssm according to arch, bottlerocket-version, and eks-version
    provided by the users.

Testing done:

cargo run --bin integ integration-test --cluster-name bottlerocket-test --region us-west-2 --bottlerocket-version 1.5.0  --arch x86_64

cargo run --bin integ integration-test --cluster-name bottlerocket-test --region us-west-2 --bottlerocket-version 1.5.0  --arch arm64

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[gthao313]

Above address Sean's comment.

Yeah. I'll different strategies for those variables.
BOTTLEROCKET_VERSION: No default, completely provided by user.
AMI_ARCH : Default to x86_64, and arm64 specified by user.
EKS_VERSION : Default to the version that matches the cluster (might be able to be generated).

[somnusfish]

Maybe define this as a pattern variable?

[gthao313]

Can you give an example about it? thanks

[somnusfish]

Something similar to

const PARAMETER_PATERN = "/aws/service/bottlerocket/aws-k8s-{}/{}/{}/image_id"
let parameter_name = format!(PARAMETER_PATERN, ...)

[gthao313]

I don't think we can use format!(PARAMETER_PATERN, ...) since format! needs syntax like format!({}, ...)`. We can change it to

const PARAMETER_PATERN = "/aws/service/bottlerocket/aws-k8s-"
let parameter_name = format!({}{}/{}/{}/image_id, PARAMETER_PATERN, ...)

But I don't think this is readable, so I would keep current format. Thanks. 👍