(aws-ssm): valueFromLookup should have an option to skip context caching

[cynicaljoy]

When using ssm.StringParameter.valueFromLookup() I would like to have the option to not store the value of the parameter in the cdk context so the parameter is resolved every time that I synth.

Use Case

In particular, I store the value of which ECR Image Tag should be deployed in my Task Definition for my Fargate Service. Currently, if I forget to cdk context --reset ... then I can potentially deploy a previous version of the application. If I was able to skip storing the value in the context I would not have to manage this risk.

Proposed Solution

ssm.StringParameter.valueFromLookup(this, '/my/ssm/parameter', { skipContext: true });

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

---

This is a 🚀 Feature Request

[mrpackethead]

There may in fact be many cases where it might be useful to have this option. not just for ssm lookups but any context lookup

[wr-cdargis]

The workaround I've been using is to build the reset into the CI/CD pipeline:

Synth = new ShellStep("Synth", new ShellStepProps
{
    InstallCommands = new[]
    {
        "npm install -g aws-cdk"
    },
    Commands = new[]
    {
        "cdk context --reset key"
    }
})

[github-actions]

This issue has received a significant amount of attention so we are automatically upgrading its priority. A member of the community will see the re-prioritization and provide an update on the issue.

[mixtah]

I have a similar use case and want to know if this is being explored any time soon?

[gautamdevendra]

any progress? similar issue here

[andreialecu]

PR at #29372 to add this